Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6dcbe271660d43…

MALICIOUS

PDF

145.4 KB Created: 2021-07-19 23:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d1b0e93791052732487736be200142e SHA-1: d4f3b44ab47fd5077d1c0718e1f1946e8069b83c SHA-256: da6dcbe271660d43bc91cbf5a43097e210c1611f235d6bc5548e3575afbf9c6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's designed to host or redirect to malicious payloads. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/0d1dcab3a70585c62b0b6fdd653a755e/zefigajoxesonakosinabis.pdf In PDF document text
    • http://ruresept.ru/files/file/34733595650.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9104362d34---87783789472.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/p28qeeemagt2fa69uq446qamgf/20172939849.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/53679665312.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6449acd3cefc308d7b7a265637062799/wabuzininiva.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5cb6c89e61ba88fcfa5b64f0dfa8c428/32241383815.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/26031163469.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/3906427056.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b1aed26fae0a1ffddc0f7159710e0943/ximofikuvezibixamuvap.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/vevolamofisemexod.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090020967b83---darowomodutemir.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f237ae17461ce700e2bc0b3f173021b5/bimilakepovozuv.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/26183524652.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608468a605ca7---569165349.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021747349493.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e80cff94---momovi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a508c59605a---detevanezekel.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8080c86e---bufemewive.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/82135743160.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u48rf0abultbh5e7vi176d1ube/mebufibavetuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+punisher+1974PDF 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_off0001db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB2F 10332 bytes
SHA-256: e35f9ee9c744b871bc70a1ee1f17dbe222c55b5177b8d35eaf83c3dd143ed52c
font_01_sfnt_off0001f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F283 17656 bytes
SHA-256: 5f416287691e3f25dede96e96714c9a65e606ea1ac7c983f2fb37ba086c4e377
font_02_sfnt_off0002205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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