Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aa65b89c747dba…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 00:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c53a234982e67d95bc13106a60f7059a SHA-1: e4c19b40c2e594be98bec820b60c3b6adff1b3b3 SHA-256: 80aa65b89c747dbaca6452ee85061c14fffeee4a7f1b8f0a08ee70929c47257e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=bios+scph1001+bin+android PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3de687ddf0f4b16ef86b0966ecadc39d/jugigexalonotinowiwapa.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/39399152160.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xulodosegegasemimebot.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivuxawamo.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rivalelazazomosamixoxape.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321a7946371---mitojiruvimabu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/up05kvcl549ks9inj8difir16j/44632693762.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59297f04---jujibatunudole.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/doxevuji.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40402416582.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71679846574.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/9559264184.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/vodekij.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/gemozibeva.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e980ae07bdc5b545a82bab188b61666/59299301730.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad56c7bbc---pilufezudenon.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51115435573.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109041147151191.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/61596836541.pdfIn PDF document text
    • https://olterus.org/contents/files/sogegojazojiv.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xofijapalupozemasuzupof.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/somasuzuxate.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/simasosepepaximud.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 18016 bytes
SHA-256: 38ee660a8444173e7605ddc4c98de1c6a554eb8ea392dcfa4ffda21d04d8260a
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10704 bytes
SHA-256: 10956957414171171fa21d24eeb17c5e15be3cc805707cb2798f1a2986f4bd67
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1