Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e1a919bb83331b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 22:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f75864762f9e4045790021105b80b10d SHA-1: c2e7aa61fc3a8cadbf479e390f8aff87da0f1c0a SHA-256: f5e1a919bb83331bb06ede7933925c9d2a57bd1d9a5e43aee36a3ddf3c195645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/280dbdad01f87e25364285208e0e7f66/fagazavuwubujutexepax.pdf In PDF document text
    • http://bon-mar.com/fck_user_files/file/zejupezusokedixozo.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884066fb9a---redunebop.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wikelubepoduxivunugudibob.pdfIn PDF document text
    • https://petikdaun.com/contents//files/gipano.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/woxabujapo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0g8a9rt7bv36utpmf0vc47vkqv/zoboriluseti.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/23888218318.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bulabem.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gaxopi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/58753354071.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/16797075045.pdfIn PDF document text
    • http://zerosquareonline.com/file/revoripibemozipojira.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/14534734280.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a4c4f5c8c9145a7f599fa2f9ed5c4596/29095830900.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/tivowazigugud.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b8598b13---45449948186.pdfIn PDF document text
    • http://haai.org/upload/file/66253134744.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea1110c0e---31733800789.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/33524091601.pdfIn PDF document text
    • http://holzweiss.at/37795050894.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fddc6cc3---kezekofoguwilonegeled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=slope+intercept+form+worksheet+cc+math+1+standardsPDF 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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 16704 bytes
SHA-256: c005ace94042febe691619ad6238a1cea16b501393e0c9f627273762c873e444
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 11188 bytes
SHA-256: 4887612153a62b8f4be319b610b42a6dffef8b61de0152103ba1c2db9bf0d008
font_02_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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