Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29f224420c44bec…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 21:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 352f7f3730a03748b1caa77397b018c5 SHA-1: b8e038f53a8a53c4e6d7aa06af398b44c537a311 SHA-256: c29f224420c44becaf63218e2eaac399e812562df0e2ddc9c32085bbae54c05f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. Although no scripts were extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, points towards a phishing or credential harvesting campaign. The file's structure and embedded URLs are consistent with a malicious document designed to trick users into engaging with a fraudulent service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=protter+morrey+calculus+analytic+geometry+pdf PDF link annotation
    • http://sinhorelli.com/userfiles/file/kibaweberopud.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/86483732090.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/labokowubaxatenadulipodus.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/xazodivadifakaxugodesagik.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8f78654d3---jatiligugasonapemuzog.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gqbcailv8lku34f7nsct42h5n7/20335199849.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609add375d2b2---jitipigotukirawejiwumoke.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/muvenifuxozana.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/87887750993.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81864937794.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/41514330430.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/fedinabuzumevadakepa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cfb2d8b74245db6b0f19802013bae2dd/denojakobuvix.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/sukokadagedit.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/betesizurugufa.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc73944b0---potumofesoweja.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf3ea188---33564625477.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf130cde67---24926029075.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210729_0176FD63337BCC47.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0203e7cad2ad7f4ee75d0a3ef04e1e83/82680331738.pdfIn PDF document text
    • https://istanajp2.com/contents/files/72636480357.pdfIn PDF document text
    • https://oicenglish.com/imagexx/files/desevutofuxomev.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/55302672884.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72d51d4dd---66942580923.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/mevorer.pdfIn PDF document text
    • 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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 11180 bytes
SHA-256: 62dca3ab2da72b8633abd69270d6a5b4ed0c7bbe97cfa2c796307d39281a0f83
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 17212 bytes
SHA-256: c35c7bee5e327d3a35d66739c528848c73245c36cc3ad945d594878bbc15b8d1
font_02_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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