Malicious PDF — malware analysis report

Static analysis result for SHA-256 50df0f45ed2f5766…

MALICIOUS

PDF

94.2 KB Created: 2021-06-12 18:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 14725b13918c2d9ae0547f6b378d3799 SHA-1: 35a14daf877d0687a34a17f24c7d753474aab03e SHA-256: 50df0f45ed2f5766ac169dc5bfeb40534e0564886df257f54f309b8d5d0644f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=design+your+own+avatar+character PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a7c14a380263cf1482d6700f67203fe0/dolenufomutu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c72fb82827---sezasitej.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78f116997eb2f5a3c935161c471772e4/40682602725.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkieufsjvmvruhgv2b99eaur4g/gilelisotumobepakesidag.pdfIn PDF document text
    • http://uci.ir/userfiles/file/jodomox.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2c82db5e8437c8f3693717435df17ac7/38328269856.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/3524783771.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa178dca06b---miwazademaxedufuresun.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8cvels2ad8ce5kv2hoofro3tpl/difirolosefilagarabora.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sg888r75rkg912nk9i43dd9c51/58946804301.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/65878afecff44f8b54d2bef129001a9e/68661795318.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/funaxilixutitavef.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/g6lqmjsdcptavpiv30ajetcrdo/7508168699.pdfIn PDF document text
    • http://drironcat.com/images/file/95869105242.pdfIn PDF document text
    • https://aedwea.com/upload/foto/petakobomabo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96476871026.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46aa2d48d---88980106117.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/d7odf41ss4kde543n02pt1ka53/gimol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 22476 bytes
SHA-256: 194af837b2ec59b2493a4f7c9fbea2ced89351fa5cb3f2b3d7ca51a0718ab49d
font_01_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 5280 bytes
SHA-256: 5efafccfaa007fe32a1e85ddbff60c75e10e3cc618ba2fa5f42de21cf5fdf304
font_02_sfnt_off0001463a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463A 10872 bytes
SHA-256: 5554a9af5dcfa775d1cd6b3b5980b0f3bed218889803986da6d5a7269a3ac985