Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1f79e0327401ba…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 19:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 71b2521afeeb70e11dd00bae97285e28 SHA-1: cd78aa08ac27315e0fd43aa070810a8e53683b72 SHA-256: 3c1f79e0327401bafaa8d89da8d07539be6ab6e32d9e7bdc8afed62387012745
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it is designed to host malicious content. The presence of a callback lure indicates a social engineering attempt to trick users into contacting the attacker under the guise of resolving a billing or security issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://handgun.ee/media/file/mibojanovafojotubow.pdf In PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fevifodinebabexavisosem.pdfIn PDF document text
    • http://hydrem.ru/images/file/50331612693.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7097b2c91346a61137c3753abd01796f/dikatapebumure.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/69685105159.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/govotivepadaverixe.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddcf2446c3---zigudorikoxokakemubimagel.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/bifelefawujapavezami.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608908c708e28---96250065491.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xarinewojazeketavepuxowep.pdfIn PDF document text
    • http://caramelitos.sk/files/19376969430.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1c8c4641---52204022709.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/86820049939.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fb5c492f---69740507952.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609707c884dd4---fiminapuvodosutokesaxi.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/e4793269dbdf8076d696eba82d8ea324/puperipaxada.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc14ae033---zurezeduluje.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8276948e0---desasodigifore.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/juserusi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/69581706692.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/begumixu.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/dotibezotuvade.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/zamujataluxusopaxigigo.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/57188384507.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/sakividegevomom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=carrier+30ra+pro+dialog+plus+manualPDF 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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 11064 bytes
SHA-256: 8520653fb21ec9a49c9e2698b70597560a718f26fde78ebcfe2333741bffe9a2
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 19016 bytes
SHA-256: 3becd4b7be0825cbafd98023f7434a8e744242ca9386e7c35cd6d5af728a2893

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