Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33c42edb9dd6243…

MALICIOUS

PDF

93.6 KB Created: 2021-07-02 01:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e87de6a600030b402bf049a0312815b8 SHA-1: 8437561b7ba1574cdba4d6adc7a41402f8131964 SHA-256: f33c42edb9dd6243643753c454fc552636d620a03101ae2f1428e9d4e2dc9314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078516a3b4cd---vigev.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f4306268---40366961739.pdf
    • http://canvangdientu.com/images/file/zivivevuboposogama.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6a069851f96f90d509895b2191dbdda3/koxewej.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ee109367eab9157652559e0ec7e055f/94674266148.pdf
    • http://gonuldoviz.com/upload/ckfinder/files/82270750426.pdf
    • http://tfforming.ru/d/files/putirotetan.pdf
    • http://photo-preiss.com/upload_files/files/48772527093.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fc78071626---vuvonefevovogevegazuz.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/46ff221db65ae2d77ad17ff7764976dc/mitor.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607746fdf362f---80084564403.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kujufenufutaguwupanibube.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eoaqviv8gue0epftvhbto8dot1/zabasolobolakinigug.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/dirutawejuvelas.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1e3b5a2bc25b708cb9c498b998f4532d/pekiga.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f470553f9---zifoz.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jace02c54p5evg7fgob2jqjfg7/nokalifotuzogebexazuxa.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b44a93ba---pesapenoluz.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080348d02ed8---94607909293.pdf
    • http://traslochimontalto.it/userfiles/files/45973329901.pdf
    • http://akademibt.com/resimler/files/14490209538.pdf
    • http://atenngo.com/admin/sites/site/documents/28958986284.pdf
    • http://toanlinh.vn/upload/files/dukonukupazojilelubi.pdf
    • http://crm333.com/documentos/file/josidisikefejugudobexan.pdf
    • https://ratsimae.ee/media/contents/file/fezezeni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=formula+of+surface+area+of+cube+and+cuboid
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c2.bin
c89a476b3a20f98f7b23c77dd50274d7e7405ce01cf930a6b647ae42f77cb6c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 10756 bytes
font_01_sfnt_off00010b68.bin
62ced2b2cd47aa44d1d27549dcf71ccecd13ca544b5628976c6d7b47eaf48ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 17880 bytes
font_02_sfnt_off00013ac5.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 16088 bytes
font_03_sfnt_off00014ffa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFA 16792 bytes