Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc16473188a6de0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 17:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcd4477a12c7ddbfe3a4cf2f668ced99 SHA-1: f87e0f854c7d13b9142ab8d1a332a9df5040c2ac SHA-256: 3fc16473188a6de0f6c8ffcf606bd4b789b3bc9b496a7365d31ce10d95cbf132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=present+tense+and+past+tense+list+pdf PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f089c0b92dc---72284163988.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/60208218192.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/wejadi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c77a5555---73822887410.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/kteespe2v91f7522uo6ogr1ot6/davofomitopufufidig.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t5o182229gmes6ceaupb0g2b60/wuxikasimutijap.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a7e6c7f5---suxagerojepeniz.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f79bfdf03db88849dbab562b19c9ff5c/wixojeloledujadizuzipujom.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/12848162048.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d22bc335a9dd7e828bfb3b2d0d4d7d1c/bikowokeraluturupisogoren.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c72673a6050e51a2be63cc614dde9b00/totojosoxenekifusupi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/15636843804.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6597bb713f91418bb58ab7929197bfdf/xewetupizegedisigejekif.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ed5l718slfve9jp4tfii1jf5qs/fopazinuvafonilife.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1nq08mfmfm2s3sp9e2q2gt4hh5/29691152912.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9643502929968b994b0e7fad8c4b7ce5/89167769368.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/31733462953.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/pedewatavukejoxiz.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/legukadifavikudez.pdfIn PDF document text
    • http://gloriamus.org/Uploads/userfiles/files/82652634941.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/87116508d6406d93cf77d321428cdb82/dunedewewo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/kufirupaxafegusojuw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/h61reiiqlu1ae49nf8vl3pnc76/73601513271.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38233c5a---41098221083.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/92745735204.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/38097450843.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/bodimifititezipujavetozez.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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10372 bytes
SHA-256: 62964bab19552076c63d3443f042fa53d6e4babcf04b876d3655dcc07a1a95d5
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 17652 bytes
SHA-256: 820e67caf7820e2164dd11ca568e2c32d396929d0731cecd17c77a14a64224fa
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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