Malicious PDF — malware analysis report

Static analysis result for SHA-256 94009806f29eed7e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 05:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 239a5541acd284c43542c16840f9bb29 SHA-1: 65324c2587d213d7a983950a8268cde1a98ba952 SHA-256: 94009806f29eed7e26acd888aaceb21e1863f900d12ee08fac9283cd756ce1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

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://laborke.ru/uplcv?utm_term=ssc+cgl+answer+key+2018+pdf PDF link annotation
    • http://skikk.be/app/webroot/files/userfiles/files/89769544686.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/38314855138.pdfIn PDF document text
    • http://gibisch.biz/files/files/teditalod.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/80082575051.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/fot4pmp2m5n6d8otglvlgk3erc/jijikizufumumudowus.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/54680013796.pdfIn PDF document text
    • http://sgpeo.pl/users//file/koxadajifetafagak.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bc7a1416---zoliduxinowujeku.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/20679409336.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/menepoxotosuxij.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/28704281776.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/72778984016.pdfIn PDF document text
    • https://etadelloro.it/images/file/zemuwobe.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/zisupalemu.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/73015421739.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/jutexarejesotudova.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/pawepaluzanamab.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d297277c---98591308609.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/gagigowipitomiduju.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92df7b4542---sesivuge.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/fokinuf.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nuxolire.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2867d51aee---21029711432.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2a9ef1a283e984d178838b25a60403e0/jifozokijizalibugekuvaxu.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_off0000ba6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 17036 bytes
SHA-256: 3ad1ed486ed3c34cbb6673416d5b9e4038a41f946c63f053a04d5c2adaa36ff2
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 11352 bytes
SHA-256: f9eaf4f64d7147beb49a77f26581b4edbc835e444883ed171d57daaeffc19e7b
font_02_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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