Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98852c8c0475657…

MALICIOUS

PDF

88.7 KB Created: 2021-07-08 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dc58813ae459358fbfdabc7ea6d09c3 SHA-1: 6ad37a33510caec3619e868d5d0e46daffa8e862 SHA-256: b98852c8c0475657dc1fe8655019c9fd0416bb80e6c3ae02a185bf6bf4b6293a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The file's structure suggests it acts as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bhttourist.com/upload/fckimagesfile/11634786308.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f538036ebf---ziluniwuvewikiwemuponak.pdf
    • http://fosterfreezesantarosa.com/uploads/files/74588611883.pdf
    • https://equinox-e.com/upload/files/dilolukofefik.pdf
    • http://cissi.it/userfiles/files/totiwef.pdf
    • http://nedirajtebosnu.net/userfiles/file/22730718906.pdf
    • https://maturana.cl/upload/file/rewevifajunibuto.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0j62auuetnkigkrpr1p402et4v/22322817926.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e085edc5c6d8bb4f3646265c645f6f88/potebimi.pdf
    • http://thetestmag.com/userfiles/files/sukoworijubidurojorotomo.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ijttcfkj7470vp9krsa2oa5l73/99264166435.pdf
    • https://alice-immo.com/userfiles/file/58256174055.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/p7op8l6avn14ev85e6191ti464/45774175983.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/24hp1oj0s54igihkqlahicsv2h/78844671657.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097de813233d---kinaxok.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c525388e58ae120c6772b40658b45790/28358643672.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hnnrfardjcajmjmjrlip1if42o/98380593824.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/41d8e54c8fae10673f1fcd94a2bd3324/3786027658.pdf
    • http://notariocprietoa.com/notaria/documentos/files/26926852315.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ef6012e7---suzamusisenibetoxisezu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ga47p4ckl73275hg96nnrjg355/43457711327.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/866220f8c7ee5012a22639f9ab3066de/kamaduruvadezikoxa.pdf
    • http://feynburg-uhren.de/uploads/vepimatemovunapilofaresel.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/82078196777.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oebqe7addt4a9nhvd9muu6b2vo/bivabeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tuesdays+with+morrie+nonfiction
    • 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_off0000f41c.bin
0f5c2a09d948ed246a780b9bdb6bd12dbeec8fea1cbdb3f252c16961bcaaad34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10956 bytes
font_01_sfnt_off00010d76.bin
7715d5f2260b7f7b009b551d33d03c048e19cd7f9c4e4158c6f70ee1e3faa50c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 18216 bytes
font_02_sfnt_off00013d67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 16792 bytes