Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe3775b2dbd6c82…

MALICIOUS

PDF

84.8 KB Created: 2021-07-15 09:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b025f638dff8dadcc8323574deb8bf17 SHA-1: 932adf6b6f22955120882eed228cfa64edf3b99f SHA-256: 6fe3775b2dbd6c82f0e2c21dc996188fb731431b3b4e37650c8175709b33938f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The primary attack pattern involves directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://himalayanwanderer.com/himalayan/userfiles/files/wuxomakamozebise.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818da00b36f---matitegevagovudafof.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/j10d98ci76eh1h66cglcj13k87/56548682446.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/7ncamsgg3apr1fr5g5cdepn287/37923030928.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c96fd01a78a716d0c7a2d689d2b5908d/xakoragagokawifox.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f5hcv029kojtoulbfc9vmcth40/3344349143.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/84444444693.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29b2934e2---70562947078.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/48456673827.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/badap.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o6id2968p6tbelee6cg64pnirm/6773545142.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/54ac12ec652769980874d04208a0cdc5/misasetunisodokupumode.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cbc6a5d9---42679504831.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/nakesavan.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/80272455548.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/gonedapavudukofomopag.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c3adb02bc---97451389987.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/nimobopuwobizigufab.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608423132ce8a---balejugimari.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/88532527756.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a024d2c6306---renotedolebuxamezapujof.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d5f5f8e7---vivumedodivo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0aef42c51066d7be04c72cec75b81d79/xibatajubevak.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e4652fc3c68635129118e4efc5663bb8/63316821245.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/88555654181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=monasticism+in+the+middle+agesPDF 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10712 bytes
SHA-256: 134296864d1dd5567b22f5bbd70af58a612c817235bcbb4768c3b8e20930f8e0
font_02_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16916 bytes
SHA-256: 060a026f86f92893ef7ceb58bb2b295b6cb59e1aaf5b6f0884dfe17ef0b3099e