Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60601cbb6ca2916…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 10:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59d933a8982c342fea7c0d4d34d1d860 SHA-1: 940250ee18e75e306766651284e6d8e1c529bb60 SHA-256: a60601cbb6ca2916f750cd4c2d76bfa7e8ce5b0566f53ba214784a4b5c9d3507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host phishing pages or further malware. The PDF structure and embedded links suggest it is part of a phishing campaign, potentially delivered as a spearphishing attachment.

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ce78219b---89659272774.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1oud6tlk550ar8n594k93h0b3u/lugemade.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/stujha47b0btmp93tqt7hm007n/14410012013.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca4c294c7f7a7576386554dfc588e698/19525170632.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/713a28cb8c928d477002d00678eec0da/1573881600.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/pigoniworelune.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/38b35hkr061hs37uvj22kkifhe/62236938523.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pupimunolagi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/guiimeldlrr2t161kfg4s4ho3s/pofagutin.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4eebc544---zafikeberakixowavumapozul.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8306214009a6ba457d59d35169dd03bb/62770808905.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc4e6d634---5106511451.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jr7du9163u74mf7c7h1tak5gke/97991854514.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/joluvuni.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ldqffgs685jtla4f7pugcsas1vo5cu4g/62986588231.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/vqko6fg77u3ea2tts3u5b0lg7e/72571708312.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/77546719722.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vrfklp68mj5g6qfhvu9e176s84/xomigakazuwodasarozudim.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/31056177519.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbcc74501---gesabuduwuro.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/o4a4bdcv915009envjr23ma3f7/76674319764.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca067181b---28206373904.pdfIn PDF document text
    • https://andana.us/files/files/dixefijuti.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/mepasunokukefikiwitabel.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081115ce1e7a---mafogakabirubisekimek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lego+mars+mission+gamePDF 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 17164 bytes
SHA-256: 8e618190a6e005b04efde2807388bc438dc20743e9be1ba91a81759161ee7e7c
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 10264 bytes
SHA-256: f284bfc6f98e74929b7dc7fa0e13fbe36b912dcf17f741b9e1af7d2f40b93641