Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc8354db672e35e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 04:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 072938ae4801c483c488335b8730ebd0 SHA-1: fff39fc784b37e3847c9aa6323a79fdbc142277c SHA-256: edc8354db672e35e0d6a4cfa46960e9f033326c991a6e304d4814408675c3126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as a distribution point for phishing attempts or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://krisoc.ru/uplcv?utm_term=mackie+1604-vlz+pro+mixer+manual PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01a5070ec.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdba49c48---4769485006.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/20126476903.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac190a0675---21530856304.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/75530439705.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc9acc8dc---68107992721.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ea2ec0754---25988047147.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1fdd114---30507261034.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7448d105f---79968668144.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/72047803358.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ln8t4148v0tcvjkmmp7qtk4n12/towezijisiravojibamu.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/bixosikex.pdfIn PDF document text
    • https://hiroyoung.com/data/files/63957051036.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/tajak.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/38e595724ed00d839308172e0472e390/53428262203.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/pinuxotakava.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/32028448773.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/72670705689.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/pomepe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4797c094d7---17226437229.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb93365ff---biwisujo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6fb8fkt8e8qi1o9jti11ltgob/80641421845.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/kazakegolulilavik.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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 17760 bytes
SHA-256: 10870a21de763819f99202e4a22ab89b60cc7eed1ad219efdd84485629bb9ef5
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11136 bytes
SHA-256: 4edfe01455abf757e8d9ab3e0de97ecef7598fbbeefd5edb53f5309426325c0a

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