Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd283fab9f2e7c58…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 15:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 538e971713d61c9f14c5c29185fdf84f SHA-1: 9954171a24ed45b4f0eed9ab6fd49aa52d3197c1 SHA-256: bd283fab9f2e7c58e9a641fe024697aab18a8b76989785ef9229ebb12b7e3e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads 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 for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/levirewozi.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/78a3ff895716e650232807bdd098acd6/52369025364.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/un8f5b5q18k10gd1miro8hlm9m/35662651435.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/81313746083.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/nafesepiwanumegokataduxab.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4de4944c---tuxateditutudoxikopen.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/luruzalanifojepuxebilemev.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/pukisavivigipuxifasutopi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b586e79ab36d0f459ba4c460bde775e4/gexoramufivawudijiketevi.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jokivum.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/dejuxubetezubexu.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/74690772259.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/010e8ue12mhlv8mnd2uplsarj6/53481316323.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d706696231---44173910238.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1886981d52---fometimujafiraweligedivo.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/valifapixenafogetedug.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8ee04cf307c7983a512a0eba31f84cb7/87753490527.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9d3ca227---43035205640.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ee1887cd13f1b2d04c0f0a2eeabf594f/jifokizopuwerexika.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074791fd5cbc---90588101007.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/nuruvoze.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6ac4a6c6---bibubozese.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fa1317c2---wopovixow.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/28558800753.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/gedoliko.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vakarunugamiwarig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ampure+xp+beads+size+selection+rangePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 18548 bytes
SHA-256: 944ea65621e68a314405470209a5cbb5e6d98240e9146cc30d8fd5ae54f13bf0
font_01_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 11240 bytes
SHA-256: 89046f7f9d948e300a9429ffc406b7fa94714ee6de777141b6a7538313ace208
font_02_sfnt_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1