Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa521b34ddb91b95…

MALICIOUS

PDF

89.0 KB Created: 2021-08-01 18:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a0d0299d84adde1ab435911697485b8 SHA-1: 3f86e40b418ce01e7312825972cc9a23f0f5a796 SHA-256: aa521b34ddb91b954bcd20df4c6ed097191dc56efc89aeb00810b347d699a5aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates it employs social engineering to trick users into running commands, likely to download and execute a second-stage payload. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a distribution mechanism for such payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0ed61b7282e137b1563470169a5a9fcb/50578691383.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6902c66b9---60419522332.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbbc0bfef.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210724_0CE685C3487E7E50.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zulamuwupizef.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/78232407776.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ldv6tp8dl07i00f7adud8on9l4/gopekorudu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/64907391727.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gd5omlfsmtg6rfmihc5hv836l4/xixivovupediwuk.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/pajilu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0bbc4c353---9235759178.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4524959370---46768739516.pdfIn PDF document text
    • http://alkanboya.com/files/file///parobumorobidogogive.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f034b612779---jujevemunojejezesutuk.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ebe14987---bupobuwedojiporefekamatu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bfa7f78b---34835104100.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/07ab25343ae75eea8ae08dec17fbe5c9/fevufumenikepafukuwazej.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/budajonajigud.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/3511530533.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/90092707306.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160921d6acbcd6---forivusenado.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094960e62e56---poveg.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ab8566358b13bd0eb6137dfe2f962e6c/pixolipide.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6599f280---64856085937.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da98c1789b8---76473910143.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099467c980a9---vemawuguxowowuv.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/260034506.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1521be3a4---36834176812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=keyboard+shortcut+keys+in+gujarati+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 17412 bytes
SHA-256: c954ea364a982eaf62acd3dd32bcac9dcfbcf2f9fd56fddf51884fbe47c04a7a
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 11420 bytes
SHA-256: 1c0d5d6806400b772fea54991795fcf469fcb625f38af887c6737ca875827be2
font_02_sfnt_off00013d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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