Malicious PDF — malware analysis report

Static analysis result for SHA-256 3268cda246dc9d35…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 21:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6083d642e42cd83956e65cdfee69d4a SHA-1: 47b01d956fc25713072c67ea226f492c368ad42a SHA-256: 3268cda246dc9d3536c3b21002b499578eafa8ce62a92537c0be44b8a4ee933a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards the potential for exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://js-space.de/userfiles/file/98668164273.pdf In PDF document text
    • http://dade666.com/userfiles/202109file/2021090411093770554.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/79643448519.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/95433552442.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xifipe.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/76623549649.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/luvepivivizagufigasuvit.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a0cc83b---tidogelupotudux.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/81244245659.pdfIn PDF document text
    • https://majubesar.info/contents/files/98608203061.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/59179629667.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/gedubarabuzutepelikezof.pdfIn PDF document text
    • https://sadex.pl/fck/file/botafetuvejadav.pdfIn PDF document text
    • https://halkum.rs/files/83117338645.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/21705249164.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/wotodupu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qvg7efe6a8kv2sgtvhvqqg44hk/dagobimuterez.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/61597848645.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/56224567687.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jpvbev4n4gpo9rqma570826917/12740147472.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/segelijepapusaj.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/sidudujexedusajewegi.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/29931698496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+wifi+calling+in+redmi+note+8PDF 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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 17656 bytes
SHA-256: db434f1a47b0db4c253cebf2301570c5dd726a56b41db93ab2dc482a3ea09917
font_01_sfnt_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 11204 bytes
SHA-256: 518b08837261c0cbcd5c9ba080fe8b7c337886b49367752488dd5644785c8af0
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1