Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b7a02e10b05b49…

MALICIOUS

PDF

113.8 KB Created: 2021-06-30 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 94c95bfc82336e778cf54581de3d7054 SHA-1: c9242e282be1629e35e404512eb8b48041bbb4fd SHA-256: 99b7a02e10b05b49fbea033006d85c79f3bb0bad2347402ce3e744f0b3b8a6c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2524

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 https://pistant.ru/uplcv?utm_term=norse+rune+reading PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776e3878e1e---detitelemi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jezekikutugimogazowo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080cfeeb2b4b---vivirajogiserikafeko.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609477d60c1f6---zujos.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9efb2a418---6951322988.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezaweno.pdfIn PDF document text
    • http://erictex.com/ufiles/files/wovukaxuxowenibawuvemuluf.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/vec78p9tia5i45g1it4co2fp2n/duradesi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03ee83e2b---tapetigelozis.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a3be65be---futowemuwajunewud.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/78482394441.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e118bbe135---61192626230.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/dadapoxetojidugomozikav.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2vudr2q1u9ebifcf38mg61qml3/5492523293.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca8eb74fb---sudekazugupokenelodov.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/17086780773.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kabapinaw.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/14245523951.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/t88pbbd6ulusn5730hg84huso1/gimulusesaviraruza.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7fa8abce6ab36cb57be58aab816fc86c/vesurutog.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/65554851449.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/331453c504fba12bc2d49a3da4cf2cfe/zukituwukenuxo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t03npnfnginq7gmucp20coij64/49261380130.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6c43aeb5---fenin.pdfIn 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_off00015a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2E 22056 bytes
SHA-256: a8c12b1b13892553a35bf97fb3ca9dacfb6e2e1e37348bac4cd4e26784d98f99
font_01_sfnt_off000191ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C2 10356 bytes
SHA-256: 5f1482c67c142875ddac4624c79b31aacc969d07bfc105885b7693e1239bf2e7

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