Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f70243f286c33dc…

MALICIOUS

PDF

97.1 KB Created: 2021-09-06 00:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 060a8859d0b1834c5dc333a75569bec7 SHA-1: 4560fae07d3721bbb5720a60cb28f276b23551d3 SHA-256: 4f70243f286c33dcd4cdbe8881944c91e2792534bd70f82c14473329e539f4a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44bd61da5---gelogomamewozivulojurawak.pdf In PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/tunutes.pdfIn PDF document text
    • http://royalgroup.at/tmp/julabutojom.pdfIn PDF document text
    • http://vce34.ru/attachments/file/80280231914.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5c2370fa---kebudevalejowapi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/10dc168ec5924a254d19841b8c3a8e70/24403639108.pdfIn PDF document text
    • http://camonetinternational.com/files/file/56029048373.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f4dd4100---60101895175.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fad15683ae522ef7fe8ae9f2fa65d790/93476081286.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609336bc72544---vofebadurus.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c5dd46cd---zozep.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ac5482e---lujazikukuj.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/xamenumutemiwa.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/93846589805.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/87639409814.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/56885018044.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/61119341119.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/7013165645.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/12901555460.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/20262704529.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/13432295639.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hso6g8mru7du6ngia9i999a0g0/73272717696.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c7567b97---lovosesedi.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/3831119844.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/51b1b4937bb58ec8bb75ebbd7a107334/85162476851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anticoagulantes+orales+pdf+2017PDF 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_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 11220 bytes
SHA-256: 0803c3d89be1c3ae6227ca976efd6f717b04a6b1d32c6b6f7cb17a2ebf6a8122
font_01_sfnt_off00012b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 19724 bytes
SHA-256: a7f94242d963ad4307ca42fd1925b8ebcafe0bfc29b32a2c45f373055ef7287c

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