Malicious PDF — malware analysis report

Static analysis result for SHA-256 30561c3232183e38…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 15:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d31749f50dbc9511fba40527fa5be56b SHA-1: 1e05ebb912a1d4cce0466f0d3890b5bef5bcd7ce SHA-256: 30561c3232183e38fac4dc7979e8bb9513f895162283b6affcbdc55e1f96375e
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious destinations. The 'SE_CALLBACK_LURE' heuristic indicates a potential for callback phishing or tech-support scams. While no scripts were extracted, the ML classifier strongly flagged this PDF as malicious, supporting its role in a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c9198708---21118901004.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075c51bc920b---vigogazasotinizo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60562806---zopenopetubaw.pdfIn PDF document text
    • http://iphysiology.ru/upload/72209418800.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48354fc2b---nomalevuveriroxajaj.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dpu5jhgk8eupgmr0gvugqvqkq0/2505369357.pdfIn PDF document text
    • http://cecev.com/stockages/files/44678617736.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7712e6b1e59402d7473677536b2ce9c5/rujitapexogami.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/58a042379e34e42d329814b8bde9af37/kizorixuwivazine.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/94604374422.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/95888997267.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/4927788594.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/69618713638.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa158cb3cee27eadc34479c194c4d28/29690251374.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083637d34467---mujubob.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b29497340---46153962745.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608255f0155aa---dewolutusuwiwowizabove.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb13136a7---fukilozemekata.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/jobozetipobalefuwagaze.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/94595752010.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xivobamavepuxibipir.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vickpdad5rqs0da52on550snl1/78516762006.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8c7cb7c9---16256851055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gk+questions+on+science+with+answersPDF 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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 17500 bytes
SHA-256: 7d6dd00239e81c045a6dc2fa385afb47d306c201ad46a34d23acf768e5b8035f
font_01_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D09 10744 bytes
SHA-256: 557b65a22644a813316cf1bc074d64dae9d3e829daf2a9a20cb2d148a6f63827

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