Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8904bb630f289a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 04:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0ccf30b896dbaae7ec743bf4589ff28 SHA-1: f9a03e096fa484c31fc75cbbbb6e4b7100d8c56e SHA-256: 6f8904bb630f289ab65428ccf51887994a7f567f6ad79a97a5932b359591d806
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=girl+interrupted+book+online+pdf PDF link annotation
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/wijurifumuno.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/13266992728.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c3e0f2bc401784381358ca7bc6f53191/wokedejalivewivekigif.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/63726538514.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609466fee61d3---kiximagifebilunotixub.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/tupawezeretimurip.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b8d819680---75839620749.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/70908394233.pdfIn PDF document text
    • https://kimcert.org/E/file/29257033679.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/95884146310.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161075b7d0f4f1---nomamusabofulumotosanewi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f0f11ee9---28480248292.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2aebedee4b0eafb1dae9fef6e87cea7e/38479389189.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210728082551.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cd80af1d4a1825ef99e4e5088573ba7b/wegerabidakevofikam.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727a08d49eb---28224004846.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5d723be530a67ee4fe86c350bf31103c/20442064624.pdfIn PDF document text
    • http://ud2-140.com/files/kinusorov.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58ad2c239---pafulik.pdfIn PDF document text
    • https://seikai.jp/free_images/files/67357947887.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/pezurapekaronowafinikape.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/dovekoxizuv.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/78119784886.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/92319730165.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607346e4b5d5d---kavasawebotut.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/67496840643.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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 18160 bytes
SHA-256: b5c276fed536c6c1ec50f90a7a9e0ebda630747685c797dd626aa1c86ed7c90b
font_01_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10532 bytes
SHA-256: 04eacf3a5bfed6ae229a73880d6c04be6822d5af47e0866d4f24e7e6513d5f87
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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