Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d1afc81f62ece2…

MALICIOUS

PDF

95.2 KB Created: 2021-07-05 20:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6d10c7df442f0040a0fdf7d00b7bda6 SHA-1: ab2692cefa4ba522cac29cc59a241c2b0898278e SHA-256: a1d1afc81f62ece219d8f10831792255b6d2761581e34ed5284d17673ef766f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c9de8e15adf3e468884f0d738269e048/26579513507.pdf
    • https://bajrahrs.com/userfiles/file/wutenilizopelu.pdf
    • http://goteneplast.se/files/images/file/luvopedigas.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080af7a3fa07---dofenigawaf.pdf
    • https://fototipia.hu/files/files/98201387738.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ec7dad08e23f495bd63d536cdcd107ba/xagiwufizewimemoja.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5d227bd3---33100503947.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/451e768fab1c86866e3ed94af47ad5ee/sujiparejebotoboxe.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c76ef260667c235dfe6edb38dee1c597/75979634548.pdf
    • http://hud101.vn/webroot/img/posts/files/pafogagusawolol.pdf
    • http://dyglas.com/userData/board/file/basofezavaweludo.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab1ed927f---bemosejijapuriz.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7ac0a6400861ded105cdfce548b07ec3/25832922077.pdf
    • http://controldellaves.com/app/webroot/arxius/file/sukosupuzuwukabuzir.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/057472031ac66eeb7f44151b169269a0/solapope.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/886152daf02e8d847b82736cab64c083/87044495622.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcec046d8---94435166037.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c4ad545b8e5025ee902d89625c918c27/podubevemonovogovofabor.pdf
    • https://daismene.it/file/45415080873.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7d44bd8c---24625400321.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1aipdn86qef41g13l4v3pr7gk2/jomalanexizemuwowikimena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+actual+day+jesus+was+born
    • 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_off00011258.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
font_01_sfnt_off00012a6a.bin
5c5852ffc156b0aff1238aa10d99a550c0a40dfaf44264a29cc9939aa2580369
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16740 bytes
font_02_sfnt_off00015602.bin
def3eb6c007e92b2e4048ffbaf094e620f8a84830a67e3ea5043cb4e307b29c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15602 11032 bytes