Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdca1e30d741026…

MALICIOUS

PDF

64.0 KB Created: 2021-08-27 11:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f9c8f9b6e1b2912a2f5ec083c2c410ae SHA-1: bd39996d787ee8431c5381f769de30edbb1c542c SHA-256: afdca1e30d741026424c3e9a7069e86c854113b1e142c6fec91f54cae2c8500d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccde7f861---kefubazejuwexaxugivivemu.pdf In PDF document text
    • https://mihalex.by/files/files/labuwapekuxudumoruzud.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/8832285690.pdfIn PDF document text
    • http://acril.ru/ufiles/files/sepesibat.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ghecml0c95lbdvj85ob691eppo/budixovafo.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/netuxuruloxixutevoduwopok.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fq4itqn46gld5lnbu62g1cmdli/lijimusilugurutexi.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/niliz.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/55796219079.pdfIn macro / runtime command snippet
    • https://sealskinz.ru/files/file/75520463020.pdfIn macro / runtime command snippet
    • http://nc-israel.ru/upload/files/56783574272.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1626796532.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/66663598214.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/kineredagifipi.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0465600001627891388.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/67426800607.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/wuzolugin.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/41986391232.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/71232952334.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/mududirokofemutoluw.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/63903542636.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216211324453712.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/7016051072.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/kufenoputevujaru.pdfIn PDF document text
    • http://davisnewfoundlandfamilyrIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=function+of+a+complex+variable+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 11000 bytes
SHA-256: f32e9266b22ca3721ede98045168cc78a382766a3770b02d56b918bec7262a6a

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