Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bdb6bfb46fbb5f…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80f105d0a403d5f8f12afa3f25f32b1a SHA-1: 7d2eec3a727f38c59ef85e4f8a5b7947e44387fa SHA-256: c5bdb6bfb46fbb5f4afd052822c71c0acc79133f68b805a77055c7217290e64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=o+blood+genotype PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ae969cf4---9590324622.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46f10f14a---vevigetib.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zajefaxufe.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/14348912152.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/malekizov.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ad12d7f6---15372454686.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/73924065391.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fe17a02b01077f9824f8f27cb3ccc176/56666173603.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3dcf1502e47df717c24eda1a4081135d/66568462339.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/50482935018.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e73e1d40f---84965852780.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tobinawo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a10154226b4466a6b9f53abf387f8600/safozijilefinokekedun.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e92cde31---29124628298.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kuwifulelero.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gp0dl1hf0plb59lmputourjnok/fadijuto.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lovesiwone.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210610080732_rfxwyi.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/64575993541.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/96642945076.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/61053740232.pdfIn PDF document text
    • 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_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 17840 bytes
SHA-256: 3f86772b4cd4d62a5ead997426395d0ca346926c695aacf7d6a5462fcb49ee08
font_02_sfnt_off000149ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EC 10324 bytes
SHA-256: 465d2111cf13f6196d8f38e8d81a5a1803f3700162be1e48cc2bf3b3f8011284

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