Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93efe0956c0c5e6…

MALICIOUS

PDF

120.5 KB Created: 2021-06-30 22:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1e919a5130bce81e19b4299d23b8a724 SHA-1: 11fef330d67ace4c37f4f9c3559b4526083def0d SHA-256: e93efe0956c0c5e6c2e9e80a8d29e364ad2bffcd5e3d1088c1ae5e785ac3d7e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or other disposable hosting. Heuristics indicate it functions as a link farm, with a high ML classifier score and ClamAV detection confirming its malicious nature. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=at+your+own+discretion PDF link annotation
    • http://progfin.pl/userfiles/file/gesoruzuwefovasofano.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/2924131918.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l0h35qgt333bbj53takl53q71e/81737059645.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/78268134243.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b1b9247cfc9a4aea7319532573d44c83/luzupibumapuzur.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/jibivadifemokozonamoboxat.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/puradovuwi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/demimuzanebo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/55d2bd7c3dd881eaa168eedecc3c63d5/zetani.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/55b8e66688680bda938da0601a040c68/renubedogi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/93041207996.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57a16adaf---496406582.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qj40894ugm89i41af43j1li3f1/17246197632.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/sikusipojejezisasexeli.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/594d357f83b42068f969823cadcba165/junewusogikak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d3cb6eed---68824805047.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/9533229364.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4178c47224---zudubugoxuxuvatakatakoz.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/70731113230.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b5c8837c7fd30d879255baaaf8076040/bopadugig.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jagize.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47413480d7---vipim.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_off00017574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17574 10436 bytes
SHA-256: 4c9baa8c8ef9bf0b909fa29b1aac67fc63cc924f73106737db530e189292b7e1
font_01_sfnt_off00018d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A572 18112 bytes
SHA-256: 1e21728d7b176248b9b8b26c7abd93367a0a46c0f6dbd911e72840ee8d5fb480

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