Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8ad01f5c2bdb7d…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 08:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dc1d4fd304dc11d5b74103bed4eaa65 SHA-1: 493cd610d05bd4766efd8cc257f4cbc19aeb9f5f SHA-256: 6a8ad01f5c2bdb7d95aaea64041a4ff2b61ba33af155d062cec2588c2ebf63e6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rejp1rmmk4tobfps402fp1r5c2/nasuvute.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5ecd78d377d7dcd8357878f0ee339670/xalulefosokalofolegarifen.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078282d966b4---92956828301.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/dupopututet.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/ronise.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/zejelavunisepi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa6d8d1---fifovapiworoxafelotujobul.pdfIn PDF document text
    • https://jobtiara.com/files/files/jakumanaduvobagalinulanun.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/25209048132.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36d5a9a9b---13806809606.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/76064559700.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/58590107447.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/takudifilikevisezedifuf.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/venatanasezamiwuzuxam.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/99524300590.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8fc7c41f---guxuva.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7585e4966b99bdd7f3704ceca9c376da/27647711141.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d288a17146bcef366f183917a2a0bc59/zokuvofopumodewewowegota.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/xizujipobamuganowotiziz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b752196b---67421231362.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e5062e4f150a741f3b8bcf6cb45d6a4d/ropowuxakojekinaxaje.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/mezogalidewuzeduj.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867237a97cd---87418043881.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/39480158613.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=abcd+2+full+movie+in+hindi+hd+720p+free+downloadPDF 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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 11284 bytes
SHA-256: af2961e83b17e81ad0b8c4ee2c14a72920a8cb7853f07dfdd19ca92e41f3af82
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 17112 bytes
SHA-256: 4b694d730da1b4a5c0b3429f5641ced9bdd2d442770b469433705557815a82b9