Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1000d2d1e3c757…

MALICIOUS

PDF

89.5 KB Created: 2021-09-12 22:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68517e4096d5a9ad0cdf9444824209e4 SHA-1: 1d4b964d323214ac2233fd0912abe4270d5a359b SHA-256: 8a1000d2d1e3c75719a59fce135e1f9b179810e64f4b0b9be384982dff43045b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the nature of the links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=major+types+of+environment PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161394264827a0---zezarazopitana.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67913838529.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25191774090.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/jupajerirudidupage.pdfIn PDF document text
    • http://paradoxine.com/upload/files/40818637664.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/77468889847.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/91976035730.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/dewuvajerubefukusisudon.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/47123470006.pdfIn PDF document text
    • http://tianfonmm.com/d/files/fogijagagikusub.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zekodomolamaregoxev.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/44779587042.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/tulavelafufeguxanetafex.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/mozal.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/83004480246.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/21429615787.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/43024491750.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/sazabubesorogusuz.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/97763652483.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613058be1815b---baruluzijaramimatewoz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6f2b7b5---1495164945.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/78155132918.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/40073774345.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_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10776 bytes
SHA-256: c2349092dab871cac334739533cba67428ea96d5941a8e12dd498c8b446cbf9a
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 17156 bytes
SHA-256: 2cbf356430092c55ae6fc4d477b7876fcd69755888c66bf7e5b330d39649c6bb
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1