Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a81bac1e9b48bae…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 20:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac8d7cbce00d902d5786961fb90c09f7 SHA-1: 8dfeda8c639b21a189eec1ee8cb35ebd5ab6f0bd SHA-256: 3a81bac1e9b48baec1f29ff3fa25f023fdd162d1048e078dee58725db4a1c251
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and UTM parameters for tracking redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mytopics.it/uploads/file/81226241539.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b10e23c8edec120f88358195ec233ee4/4076568757.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/fg457nm373pumb7kov43igfdrp/24045234547.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d5f4e065---91373120350.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/rekinirezeginiza.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/15706835891.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/mexipidazovigojoxolopun.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/11946697907.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/suvodozekodu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/12417822533.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/ripufef.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/sezagakuxeburononemiware.pdfIn PDF document text
    • https://limsurdua.com/contents//files/44245279892.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb22ff76b37---87256990556.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lojekozozaxuxesitupule.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/1805432625.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a6e58616985d20057d63625f942305b5/42076899333.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34da88bef---67788273036.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/29643328235.pdfIn PDF document text
    • http://cjatkinson.com/userimages/goxarufelizokape.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d3c8ad39632965f8b9dbc3b9e5db08b/vazexasofaxowojasox.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/13077697383.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb8a13f5f---wuwobikitoxososiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jis+g3313+standard+pdfPDF 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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 17012 bytes
SHA-256: 1bce61f89a201f0d1c4f4f5520646827a0a82645e8892d7c1f7c1a91d0e0b004
font_02_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 10588 bytes
SHA-256: 20738129c56896ee4b6518aedc8340fdd6b601fd72236ed688ca56e9de56cc58

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