Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc4a13f7d012446…

MALICIOUS

PDF

117.5 KB Created: 2021-06-09 06:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 52b47c2b63c0f13dd586053b8ca4934b SHA-1: e8dc88a042a8447137d707b07c100f3f229710e2 SHA-256: 0fc4a13f7d0124467d4a6e1fa13bb07bae22daa3730ba697834a4d8f7c1fa0fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=pokemon+diamond+and+pearl+free PDF link annotation
    • http://houselandia.ru/files/78271064350.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/diganujamatexomoj.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/7161877896.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14cc017ca---89375888748.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783183f3983---31871014852.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd4c35e1c---fanibegikuradojakodo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160733ca1505cb---sadekajab.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692930408a---74797896729.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b6ee54ba---buriguwinujogasawop.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f411826144aa6a3430b15c936b6b5d5/90598590976.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nerekowezinalexitodobote.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5234a737---torediwupoxoxalijag.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/pizimesutadeziteneg.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/otj0bel0bss5trbakkd9lngn5i/zodob.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/edsmm37dksiggedjoum6gpsn70/rafejorowenotedepafum.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F79 13836 bytes
SHA-256: e16977dbf045d60a9bdb9278bad851d3cc7db0dbfbf3b26c38bc3086d7ac6dc8
font_01_sfnt_off00018b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B45 5076 bytes
SHA-256: ad45420ff9b5a9724e489808863e08b2869cdd90f7e542565b0692bd1f253ca3
font_02_sfnt_off00019c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C79 12708 bytes
SHA-256: 9af149c4afba3a0a057fc3cdb5c2e765547458e767ee1d49249b2e23b1b3c505