Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35a50e7dc1a2d2b…

MALICIOUS

PDF

83.0 KB Created: 2021-07-09 13:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3b28c3cb007f3343062bc6c39d21b2 SHA-1: b1d4597593f6a8be0036dd7c9bae2692c2b44062 SHA-256: e35a50e7dc1a2d2b49f54b44e2d24f568b42db9ba03de211a64a1c70c0478e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or engage in SEO abuse. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links and the detection indicate a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924b8777a80---memovubomotobuselorutul.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48b1c86b47bf79e0e5b69e1b750fb4fc/wijuzikefegititaxol.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094592b9058f---pibumuwi.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdf
    • http://cafehinglung.com/uploads/files/vaweti.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/891dfafd88a65266bf8cea2c9ad02ae3/31746429819.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082777a51094---dewinotugusisutu.pdf
    • http://ledson.ru/upload_picture/78303366510.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/81810433725.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831ea06ec9f---tolexaduk.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d30ac288a2b6e8cb28383fe3198fc700/34041839407.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7b8a41f5eac456183ea84d0c72a93acc/fidejikemamizevowamojuk.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1t1nl3gt7courpjg5s3k65uk72/22762303234.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pvtgp2trs50ta52er11v3l34jm/60953840037.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287a1c6409---rekirisusekidajipesapij.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l4ttsemb6cvpv0e2d9ju850a75/23226797935.pdf
    • http://galettedesrois.hu/userfiles/file/36167660526.pdf
    • http://onnetsolution.in/userfiles/file/rabixu.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/t07489akfa78m0tjhciatip1qm/kitopisak.pdf
    • https://limblength-sldf.com/userfiles/file/92197486512.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c600e67e725---26363171877.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9feb60a6---wuzeliku.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afddaa5b147---8235825169.pdf
    • https://alianzatours.com/imagenes/file/xisovol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sexiest+funny+videos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34e.bin
b5f46c25129669a9efd9b937330fe1a0f677e78d36fd96ec3fdc492b953a4611
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 17008 bytes
font_01_sfnt_off00010eed.bin
ba9bc2c1584e2446c0b71e416a9d6227ecb843c65d797602363f416a1ed5e0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 10496 bytes
font_02_sfnt_off000126fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 16792 bytes