Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd676e1582fda8…

MALICIOUS

PDF

100.0 KB Created: 2021-08-12 00:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 500322db5af419ecff916acc21e69888 SHA-1: 047a9063696f9df0888f243568b03d30ef4a016d SHA-256: 0bfd676e1582fda8d05f86458f9835f622587e7f9b860e3c7943896feafeb4f1
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 distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mikailang.net/userfiles/file/20210716104225_2017002431.pdf In PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/lazukememasobumideposil.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/332248a9d54f2c96d927b056f76f2724/juwajed.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/68659297629.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/e60d9c698d527ea0a778727a57e0f335/lipadagariwi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7slniugkbvnfdfpfhlfsto58e3/muwavez.pdfIn PDF document text
    • https://abeess.com/userfiles/file/92954723413.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/jasube.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719d2c990ab---diwurojiruwexo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87b60bd62---35736386323.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/jumavetamigefomibi.pdfIn PDF document text
    • https://tipresentoio.it/images/file/nuwipuka.pdfIn PDF document text
    • http://humanlitech.com/files/files/59803823936.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fenadenubuvadawag.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/47658780232.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0765ad9e---gekenaregasapiwakewuxa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/44204890523.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/39500241fee7d5b3cab0192685221d25/xigagem.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/zoketudejokim.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/vujolewowoko.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5a3a515248741aabe686c0df8fa84435/16530670188.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/79631835571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=1+to+1000+numbers+in+words+in+tamil+pdf+downloadPDF 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_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 11064 bytes
SHA-256: 076cbc8f3f23da0902dc4f160f15165d2a40eba16558cfb7f2e479e21f20e9d4
font_01_sfnt_off000143ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CE 15048 bytes
SHA-256: e9a98ea7b79b139f96124833b6829b6321c8d1034a79bf102f0182d8a8e51d10
font_02_sfnt_off000169ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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