Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3db755d15442b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 10:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a58beaacd9e8698510ce8da5595408fc SHA-1: b2ce97e2d01abc1f814c77dfddc342131f8a4739 SHA-256: 9ff3db755d15442bfd62e9c58c5fe363c11ef618dfe8f3255bf7fcbcfc549a0d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous links, many of which are hosted on compromised WordPress sites or disposable domains. These links likely lead to phishing pages or malware downloads, as indicated by the ML classifier and ClamAV detection. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://salvatoredivilio.it/userfiles/file/kuwigitovoduvupasonib.pdf
    • https://haysalon.com/public_html/userfiles/file/zesekagizudado.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pe3otqr3dmsjcqo213bslekhud/jetizufixekukujafoneju.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/he0jb5d3ohrnd3i1rmfqpho2gl/4661173267.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a306594614e---9060959944.pdf
    • http://brenna-ski.pl/userfiles/file/11043942485.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/61d356aff6865382f031e23c265a83e8/rifeterifelevasatuziwet.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/t0f8649e737aemcdjpp67ofgpg/minipemigaji.pdf
    • https://tylbm.com/Upload/ckeditor/files/paxivozepidup.pdf
    • https://cgeminfos.ma/upload/file/25654246735.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/sipipupolomawibet.pdf
    • https://comillaspostgrado.es/userfiles/file/89089628906.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/ruvozopupurexudugitif.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pibaj.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e0673654ace3ed6342cbb48c20452a6/41856643071.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/q2r6uog36qkt672gkj04mifnu5/59065518419.pdf
    • http://ahkkpcm.org/userfiles/jekavibuzorulikojo.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8k60hvidv99mj8kipdm9nm5ure/vinojakaf.pdf
    • http://huerural.com/uploads/image/files/51840670606.pdf
    • http://huh.hu/UserFiles/File/95559125295.pdf
    • http://sunnysolutions.it/uploads/assets/file/muvejunewurawozuwuli.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e26bec695c97fb5a82e5e0819343a687/15103462161.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/31856180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=team+building+in+communication
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6f.bin
c0aeaa508e89b399a8e2a4ec52f9b340e901a8e60f997eac23f3f6901a62f406
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 10648 bytes
font_01_sfnt_off0000f682.bin
8503231df18968f84a1dc053194c4e09a461d479a5b39adcf2a0cb4714909f76
pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 15780 bytes
font_02_sfnt_off00011ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes