Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ffcf7f165d62ba…

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 06:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0d3d75b2e7794cc840626c99a56c7aa SHA-1: 9d5eb862c4c9751d14dee9ee1f71b689061a8960 SHA-256: c4ffcf7f165d62ba221b11c5c945a3fbdb8079f18c508949487b49c247449057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The PDF structure itself is indicative of a link farm designed to redirect users, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=tyre+and+rim+standards+manual PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d6e53a694639c9b96f60b0db74c105d8/91761778097.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/gujoniz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609835fd38c37---mowepovupelijekugitikika.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a154277c0c---jetubi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef296b5df---zopumamaruxefopudegagag.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kepimebolumugubu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a6b923b4---85775440051.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/nufivijadu.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/lipivefi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zeputiledeni.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/48062247227.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vt86qh4gkte2jvsn2dgthgfevt/gaziwawotolavurilafe.pdfIn PDF document text
    • http://chikatere.com/Upload/files/52176727877.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/3250759080.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/04c3deab20b221341f2d61c07a572631/masepopapamogobusa.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/30731919808.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/fekuxusedagebusuwino.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbc8d604a---98665732086.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/938b9fc830e9f11cb426156775389faf/fumomirexade.pdfIn PDF document text
    • http://skupka54.ru/upload/m/26626814104.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/74753897156.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8253c3a90---wesil.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/94d9bfa219c6a842a434002078754123/wavis.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/33656650354.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_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10464 bytes
SHA-256: b3c597d491505053ce3da9eb8661bba000da290ca97d9aee168cc9c3216d212a
font_01_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 17592 bytes
SHA-256: 038ff00d5a604657ed3e4279e12c7b5f698d1b76ef2c3d1e441b57ae90ed9259
font_02_sfnt_off0001435f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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