Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6935f3ac116a4e1…

MALICIOUS

PDF

68.3 KB Created: 2021-09-11 23:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03b1f78009a24438ec8cc3d1025ac0a7 SHA-1: 22166ba84a30499db3b7512249e306d4f686d328 SHA-256: b6935f3ac116a4e10f52f66bf2857719b5ddaa41df88bc94d5daa832e40a100e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate these links are hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=all+ladies+do+it+full PDF link annotation
    • https://sergiomauri.com/images/file/dilubikebadalum.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c318a17c---bopuwitisawat.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/66673534355.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/36271605404.pdfIn PDF document text
    • https://umartravel.com/files/sojisefu.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/puvoviw.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/ronebutofoveromenovobomop.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zajazoti.pdfIn PDF document text
    • http://ossokahve.com/upload/file/jewikutapozal.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2073079ee---59284632090.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d99b88889---98369707529.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135be4db4631---63708143690.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/vunerigujuxeti.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeea355bb---siguzatufupi.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/4685188240.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/76110156802.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/luwirenadumijewojirofebab.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/52866197797.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346644de1a---noradurilun.pdfIn PDF document text
    • http://rideco.hu/upload/file/23623266519.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/69190052692.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/21406984756.pdfIn PDF document text
    • http://apothepharma.com/upload/files/sifepaketibesajima.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/29661908307.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 10224 bytes
SHA-256: f93dd43bae3a20360ee3bc099de05839bb4bb42b2d8eccdc51c518f5a622d626
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 14496 bytes
SHA-256: 76bb554bfc26076a1c9225ae36ed590f5bd385da2c429eacfbaf9f7e2d17f631

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