Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ab96ad54d13b6b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-16 04:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 06df92337442f8f9d1e5a749a97e3c7b SHA-1: 01a141af84c1aa249dd79b2d28d4570436cd18c7 SHA-256: 70ab96ad54d13b6b0630e29e1fdbfa78f04b426e3e9894aba9b88189674e2923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and embedded links that form a link farm, likely intended to direct users to phishing or malware download sites. The presence of these links and the overall structure suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=online+summarize+an+article+without+plagiarizing PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d64263fe6b0a1bb3839a20b5f68e98d/91176901481.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824be7abb6b---polovadumativiworiv.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gemulafenuzafaranemorudo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8ed9e8bda---38003758164.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bde5ecb55---nigibive.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1a90fbd7cd4bd960192a889be9c0b78/20259781788.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/tedekibabag.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/mojerekajita.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162413572437468228599.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6deb98cbef3c45d0f7b202b929a6c438/3314945512.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8bdb4947---zuvanupikidilap.pdfIn PDF document text
    • http://vhshf.de/File/fipexezotikigurarodokes.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/26406978733.pdfIn PDF document text
    • https://mytopics.it/uploads/file/81250622670.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d762a3f7---naxuvuxajebetif.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf59327e7---fowojobesano.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/lejozikejo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfce3618e86---89402860024.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m11rkua5819grmi17s2miv7rj0/98974140493.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851466cd553---32279069558.pdfIn PDF document text
    • http://dogable.de/userfiles/file/96004660812.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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 11092 bytes
SHA-256: 5bbff726b5b6c888dfb304dcabd75c36dc955c72abcb33b6ef014df18a4d4f51
font_01_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 17228 bytes
SHA-256: d4e17ad33f1d6f1bfb3dffe80f5208634cae34ad3748d75f2733b6f558db73dc
font_02_sfnt_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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