Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab08a863d58b858…

MALICIOUS

PDF

76.7 KB Created: 2021-05-23 14:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 98d894b207a30b856fd913f208162aa9 SHA-1: 128b70ea8865dab222f995e0d208f648d52afd54 SHA-256: 3ab08a863d58b8580dfb0e78ceaff996abb04fa569a2393c6b64f4a84e510de7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites and disposable domains, likely intended to trick users into downloading malicious applications. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being the distribution of malicious links. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://allytemp.ru/uplcv?utm_term=uc+browser+fast+downloader+app PDF link annotation
    • http://buergerforum-tirol.at/file/misawegewuxanuzuxo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25dc3b1c6---mobosivezupewuzelezimob.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/taramisawamobizok.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b4f1600712855667b2e2ff14b6a2564a/xeloruzoladuvadefo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xedinegopikalewefubini.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/298dbf93d9716ecdcede01e4cd09e69c/38500676199.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf542a9e4---jokigudaxafomur.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/532450b500f8fe3927472ecce8103e88/guridinafexosibinodes.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/86620598268.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf2dc94c3---pajidenurane.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab43c9051---92331995486.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/aj9h3omfvka9k8pv3aqefvilmr/57608111307.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7r5dgtgpdc5af7bhah01vllir5/34274272087.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/33432304773.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97fe9ef04---bolutojek.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b0aa73cfd8d331b07140db0831df15c/fekumavaweriwevop.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8139651c53a0ac095a17238288859648/luladafewekaxisuzi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a66c06197---39679329281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 5372 bytes
SHA-256: fc7dfe91a68034a69c056539617fb7e251e24f24f5cf33a950b0e710b4f98e9c
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 10172 bytes
SHA-256: 7c494beefbe007b177503d6f00cd3b8c7a0079a17cdac27fd5ca706314908334
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16448 bytes
SHA-256: f72c050da1b9d2b252b60d923d48b873e3167586161433f4ccd489531a5eaa86