Malicious PDF — malware analysis report

Static analysis result for SHA-256 e905fad926adf630…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 06:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be485c66ef208bd4f70c77cdc6c379e3 SHA-1: 5eccda6201601015499919790f3b5bc1451fb539 SHA-256: e905fad926adf630fc2466fe955d7d0620325bd84dbe6314d8f0a6f6b5707ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to various domains, many of which are hosted on disposable or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdf
    • http://siblom.ru/files/upload/file/nefinapegadokujilep.pdf
    • http://przedszkolenisko.pl/userfiles/file/12157240143.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919f7ba03e---41560076489.pdf
    • http://studioguagnoni.it/userfiles/files/zebizivexikilefiwudo.pdf
    • http://vipnjl.com/userfiles/files/gibimazobawumedeki.pdf
    • http://kronospan-mofa.hu/editor_up/dalajukema.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kumizoni.pdf
    • http://hacoauto.vn/upload/files/84346876758.pdf
    • http://fatamorgana.fr/uploads/assets/file/38914619053.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b3cb073d6d01c664692b6c5e44e6bcc1/3100448070.pdf
    • https://appvid.eus/userfiles/files/85250483877.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161437e3ca5f74---roguvarakukumawetitu.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wevexediridut.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1ak9n39epv88uvabv0p6kurnu2/62845522965.pdf
    • http://ondamarinarest.com/upload/files/10799820485.pdf
    • http://studiotecnicomartani.eu/userfiles/files/roraginemosanebavopad.pdf
    • http://ohana1bbq.com/uploads/files/24413517128.pdf
    • https://bandotrading.com/uploads/file/65501008486.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/50452724736.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/70381880254.pdf
    • https://beruanglucu.com/contents/files/9964036771.pdf
    • http://besteva.com/upload/files/wasujolirawuxokote.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+xbox+360+village+seed
    • 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_off0000deb1.bin
3025022751da23f2ef5db412dffd14aba507b323fb7fdf016b6c5c562cd3aa5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 11416 bytes
font_01_sfnt_off0000f998.bin
6c0dae0557f1f999ec45efa049b6505213f8c8dbf6142b30fd7561ba97c13bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 18304 bytes
font_02_sfnt_off000128ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes