Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d48ba4d60063069…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 23:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 31622e680107fd8fa3ac41921ec22e1a SHA-1: 21c7b8d1d463d2cb9e45242986dcd98b97a1034e SHA-256: 8d48ba4d600630694ed62600270cb4e341e144deb4690e2d005d59a9f806a5c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eobliecky.sk/userfiles/file/jidulaxo.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e68b274489987779477f6c53b3e1d714/79105243762.pdfIn PDF document text
    • http://zenithmetals.com/files/tewanoxonilexubifilowaw.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/15498508800.pdfPDF link annotation
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/bopapupejavuradapepilamu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a71705458c0---71691290191.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jezixiwenubot.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/94263778904.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/13597307862.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/86332815033.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3337db5d60---wejipux.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/gigonofebobiped.pdfIn PDF document text
    • http://poorclarescork.ie/images/kabinitiw.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/powefi.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/lexonomume.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/2657554039.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82615f676---80971363739.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/poxukolelapidalififel.pdfIn PDF document text
    • https://qnzar.com/files/48490704514.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/tizaxenujavig.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/50860514650.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/nifizavivawededele.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wejawozatazamoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mentes+sombrias+alexandra+pdfPDF 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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 10896 bytes
SHA-256: a80570fab3040b699bff25b26b1952e5fb52702cd44612af6cd7fba9999a9bd2
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 17684 bytes
SHA-256: c2d50cd4f775909b939cc11d16ba9ad37d98f7b7edb753b278c686ebcd81803a
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1