Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439f90f3cb32935…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 18:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f529211806ea3cb9fa5b6697e32adea SHA-1: 717280eba490044b459b7a8da63a2b4e70108640 SHA-256: 4439f90f3cb32935acba4e62c8f0860ed3f8c5ba7d83b010cc72f31881cd2173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5641407c63---24187290667.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3f1c405d---13410630237.pdf
    • http://ahkjt.com/upfile/file/gewevifupurajora.pdf
    • http://qkmedica.com/uploads/userfiles/file/titutig.pdf
    • http://www.darvidproperty.com/news/file/13933857532.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d5e5d207---72351944357.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99f2837e7---36561034646.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875ab000ff4---85245083613.pdf
    • http://eltonltd.ru/sites/default/files/uploads/pojoralarinivowikak.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d098780f---94204293436.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a322f826a0---47249093701.pdf
    • http://zrdb-drogbud.pl/Upload/file/60608748670.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/27775c08504de4b2a37227fe15c0dda8/61291341955.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f6a539abb69d5caccf671d795761b88/lupiwaxarobapedu.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nipivutobazes.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b366b5a88c---99648500901.pdf
    • https://fizjolech.pl/userfiles/file/xobexi.pdf
    • https://ludifrance.fr/userfiles/file/70881655129.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098505cbe16e---lugexaregife.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lqac8qh711o39sq0bsapfhohrs/6799890264.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2af69a2d1064e41909d06994ea1e1831/mosuk.pdf
    • https://eminencesolutions.in/resources/userfiles/file/49957540330.pdf
    • http://mynigaoe.com/upload/file/20210520130843.pdf
    • http://anatolianlgs.com/userfiles/file/11988474532.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=subchondral+impaction+fracture
    • 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_off0000f1cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
font_01_sfnt_off000109df.bin
5d2e0339015b923dc98bb96fb254052f25744adfb809547effbaf4c8472f1029
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16164 bytes
font_02_sfnt_off000133c6.bin
c652d4575a774b36d604995d5dbad38e7ce80f982877b331f34a66747e478a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 11032 bytes