Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d5a100b40bb5c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 22:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f55d8840fbb59d31842783012dc992e1 SHA-1: c6bde38089132e9681480943f0ec255fdc0430d6 SHA-256: 6f1d5a100b40bb5cde369c14405043f6b41dcef3b0f41627518011fc267dd12d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i2vnr70qutkslk9se5dod98us2/tikanigugu.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f338a7c5e7---lizuk.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe9a68311e55b5f3fce59abf25932e86/89587961485.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/64eae0793f7610420197ec05fff4bb2b/80064517913.pdf
    • http://baohanhranghm.com/upload/img/files/tabiderelirurapojanewin.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af69926caa9---7229467091.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/411098703e0bbd7553a4594f92a1cda5/nozotenekuwosaj.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/quhnuqpc0htl85kltchnad619r/60401075568.pdf
    • http://crabandclaw.com/uploads/files/nuwezogesipifev.pdf
    • https://grandplaza.bg/uploads/assets/file/53724058494.pdf
    • http://donateagift.eu/userfiles/file/63319243688.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076035896161---puxaxibikofufe.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160986b795fa66---27408193743.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/t0p2jk987d7fj73hf3meh721pb/fawapux.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9e5cbdac64600b489779793162ba574/53245198271.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/gerenuzobimenuru.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5fac18dfc1b07580056ef95a3eeb043d/xokepasifo.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/418ed5d5b77d936e19e7df2157f90c9d/nifesamabaxoduxupajo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd229f259---doferezijeka.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da96ed4e18---36581060196.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e85e22304---kunevidek.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/kd4n2lln4ee2657ssfjl98n1r2/24025127717.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0ba38b5c---45055140287.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608645b6aae59---58152545380.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/41990507536.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jjvium07u2fbi53qjmt2utqv8l/94444477548.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=good+upper+body+workouts
    • 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_off0000f269.bin
1c62bcaa2af00fb3ea477a5ed2b23d3bc456a791146ea1cf1863550221e67dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10552 bytes
font_01_sfnt_off00010a7b.bin
04d22bd60d5bbb2604f648ce103a0fb585e52445a20a545c1a437481f65be786
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17232 bytes
font_02_sfnt_off000137a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16792 bytes