Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c70b2b9064e327…

MALICIOUS

PDF

75.6 KB Created: 2021-06-23 04:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d2fd10d15ca1f305ac16ace7342c7be4 SHA-1: e783bf1a184633bec149d862dd04fb37c3fbe81a SHA-256: f2c70b2b9064e327a99abf2633ef1e68fbab67a88f8273e3fd291fb4957debf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sarljarry.fr/userfiles/file/kuxulupu.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dvfbk1ev6hr6fqg5judvs2i6aq/93358141841.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f59b68fff---6595064731.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/222330031540.pdfIn PDF document text
    • https://press-centr.com/images/file/kevow.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078af6471520---gowato.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9eb1d55827b4df0b3aa682081aaf02a6/29964799198.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/pegejipipofupaxojugakotuw.pdfIn PDF document text
    • https://davaocarrental.com/images/file/robegunivugupuzaka.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/rug880cjnqjh45mqj6bcrqcs5e/29812426392.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0ccf2cb5---4110680613.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/18eebe4a358ee7f710b329d32b7338ba/74551973734.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/2482001288.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/m6evjq7icgsqkbvdcam6qaguq0/ronupatowiniferopezokopud.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/29342295770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+user+guide+se+2020PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 5192 bytes
SHA-256: df9e241081527161adc030bf69ac05124cce1f451f34d4af76977d60172e6502
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 12004 bytes
SHA-256: 409c1aab81e65da878e5f7a9ee8ab08c8f89efb9a369343e1c8990962844f43c