Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7fcec5c523c5f3…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 09:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d768d6c6de86669763db5eee498bf8 SHA-1: de2529d9956cbde3826969e6d3b19e1de001f725 SHA-256: 1c7fcec5c523c5f3abe30eb2eb798cd4bdafd306cc04f4972943fb71a826c5f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eaf6dc522---wigarojijutanitaw.pdf
    • http://straps.by/ckfinder/userfiles/files/99602924047.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae3ae9f8c---debakexevikuse.pdf
    • http://zhengfutz.com/v15/Upload/file/2021831849579032.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee55f9551bd---8251942355.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/9070960003.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dd3596de---zabaferodobozotukovamujun.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/fixibulafivanazumobaki.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85ab4fe9---91569534852.pdf
    • https://harrisitalia.it/uploads/file/64215229389.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopibuvebigisijinakon.pdf
    • http://homelife-superstars.com/image/files/sulidemewugopijov.pdf
    • https://barcelona-health.com/files/galeria/files/69570159808.pdf
    • http://titadoorbinhduong.com/upload/files/42326317988.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/lozisadopuxujowizoz.pdf
    • http://rurisnet.org/images/file/gubusetipogatuzamusiz.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/2adp51qkc759go9c7t2r51tgm1/dukajizowixet.pdf
    • https://akamercedes.com/images/uploads/files/81705004091.pdf
    • http://braciszewska-klimek.pl/fck_files/file/22997388614.pdf
    • https://bahispesinde.com/gnc/veri/_files/waratixodunikobab.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/84611669869.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e49dc7e1cdae9c1578b1bc211f8d68c6/pezegaguwevorobezefetofal.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852e74578f---87009125350.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9be581d3---27435542022.pdf
    • https://ascii.tn/web/cgi/file/22871931653.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=youtube+dominique+sachse
    • 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_off0000fd9c.bin
226011323b7cc1a4e72bcc6f8e3d554ba3b816c1b404623ea34379b8b2c0079c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10856 bytes
font_01_sfnt_off00011644.bin
25f144dcad6f67ce620ece291f6cab666956cc3ba6f79a93b1c86991488690d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 19644 bytes
font_02_sfnt_off000149c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149C8 16792 bytes