Malicious PDF — malware analysis report

Static analysis result for SHA-256 15703826af601d25…

MALICIOUS

PDF

98.4 KB Created: 2021-09-06 10:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dcdcc4241e6d1ad71297fec03e5a1d0 SHA-1: be3ae7bc9a7cd3c164c386c73f2881596d228aa8 SHA-256: 15703826af601d2559f489b5e6fd22835563f6b5fce5e0bfc6ca1d5e5316b026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content indicate it's designed to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/durfp1trjmt1i4ud043905hid1/wirubexatupogowivij.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/petovubedepaxi.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08832a7c164fca4266db6975c7bdabb6/90226729980.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jkrcvfueqp1t41s7h135nsut67/12762226460.pdf
    • https://dermatologie-chamonix.com/userfiles/file/waluxanukefidanurewode.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/83f828a7f4bb495b7a49f4eadb487c3d/94400234203.pdf
    • https://www.thaiahpa.com/flash/files/tilubegofodaxibumukemesu.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d3b5d8a0823ed87125ade10501c012af/89350828841.pdf
    • https://africanresearchcenter.com/userfiles/file/25528188945.pdf
    • https://nanyangtextile.com/userfiles/file/xefasava.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/24206062662.pdf
    • http://keacg.com/upload/files/religojivob.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94182733c3---86248484096.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/deb60c13dafe3dd2843b3dd63ef8c978/wixebumat.pdf
    • http://yourtruck.be/upload/ckeditor/file/botujuwa.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jaebafev829u0as8gerelv4hc7/84510619910.pdf
    • https://vegas-shop.net/uploads/files/4220173549.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/72143311203.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/voxaripebosujufut.pdf
    • http://accessiblevehicleservices.com/userfiles/file/voziwuzubedubirelupix.pdf
    • http://fleshlight-tw.com/userfiles/file/zarufixizeta.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/fivibefebodezubopizofite.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9340ca5d7d---67099623046.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=physics+velocity+problems+and+solutions+pdf
    • 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_off0001187f.bin
eb344689cc208b58e8bcf7b04066ba513d4a7c8845716f2bcee1ac990e07a8aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 18344 bytes
font_01_sfnt_off0001491c.bin
84c5dad6f0fa9f70acefb649ce34776ad4ee7eddcadd7509fac77cbf74f292ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1491C 11308 bytes
font_02_sfnt_off00016352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16352 16792 bytes