Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f980b8042545ddb…

MALICIOUS

PDF

115.4 KB Created: 2021-06-25 16:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 206f77d973269c32049f69d8d06c6e70 SHA-1: 1fa1976f130008468655f5b3eee1056e7ef82c6a SHA-256: 9f980b8042545ddb7644db86bd8879a770a6cc940c27063f6fe3a0323972347f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://auxerretv.com/content/public/file/vedemigenorimivowinow.pdf In PDF document text
    • http://ibconsulting.it/userfiles/files/19459032450.pdfIn PDF document text
    • http://absigorta.come/file/63942782704.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858c70cd67d---luxuxalukesirewo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/45489945514.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d2d7vrsn0i6klsqbu4dqutdv13/22986884454.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e19050f563573e4302788da5fd79dd65/zejeruzav.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9af9666b0265d86902d48c87f90fd41f/tiwifozisodenirizuleni.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607819a6d01a9---9677602112.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a546d3c34---50667580494.pdfIn PDF document text
    • http://dzbnf.com/upload/file///muwexum.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaaa5c515e---41727452949.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/aadbb8a72288ca36f23847935813ddfb/94378762118.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/88081353087.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d603279---sofotapujavuzamajigajuxap.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/24259523755.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925fbfe9e68---36727125234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=winter+calligraphy+font+generatorPDF 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_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 37692 bytes
SHA-256: 7d02c8a446a9d348e3f995e2b8fc0253d1453367a90614b84992377252026831
font_01_sfnt_off00019039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19039 10696 bytes
SHA-256: ee245e26c3d830efcd87e815e46f5098895c15a88ce25a24030b5bcb07e5b0c1
font_02_sfnt_off0001a8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1