Malicious PDF — malware analysis report

Static analysis result for SHA-256 3237a9536af2aa11…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 06:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de6dcd399714c0ae3785a766cb1ba3fa SHA-1: 6400c5ac2c40e0fcc5a307de386a75547cfe075c SHA-256: 3237a9536af2aa11abf7c49a2b8325c92ca1b0c8414afde859c397e7c45cda3e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607e563e2ff16---vifubelasoxobobosugix.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b25b50255---16713218052.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/d8b3e9fe88e7d099679ba724cfdd599e/giwusaborazug.pdf
    • https://astek-telem.fr/userfiles/file/880072528.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/wepujelanopetalokadu.pdf
    • https://mmagame.com/userfiles/file/tumugujolat.pdf
    • http://nedirajtebosnu.net/userfiles/file/wefemozulevegowowekezidi.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/moforososoxafu.pdf
    • http://allycatering.com/userfiles/88759185866.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609155bda6bac---jepikugoz.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c4e6382a246061218acdb38118bcdef9/tevub.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0363904123947ba62e58833b3217274e/lemab.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/ximis.pdf
    • https://chmelo.hu/sites/default/files/file/41984120505.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee829d7fd---mavemasax.pdf
    • https://luminex.pl/upload/file/fakozoludavefofapafak.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bc27ac52---maxagizizevurirego.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc8440419---27641774699.pdf
    • https://alakharia.com/public_html/userfiles/file/83659351037.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ou8le0j05nvame4tb9ng0oki0o/lapofixaratujisiju.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cb334ac7---81743146113.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=depressive+thoughts+examples
    • 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_off00010175.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16792 bytes
font_01_sfnt_off0001198c.bin
b1cf18af068ec13f311b3728e5a3fbd78e7686d4b2aba1f3d24e18baa82d4764
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 10864 bytes
font_02_sfnt_off000132bc.bin
a413e1970b144c49f32656e1e798f11e39a64e835c8c2f49002f56047877db8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16964 bytes