Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafbcc50460a44fd…

MALICIOUS

PDF

97.7 KB Created: 2021-07-20 05:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 409b5e9ab3d092c40a6c598596814b9a SHA-1: edb2754db3bce290da6542ce1ada451f0bec7ada SHA-256: bafbcc50460a44fddd23b976f2e5c7888aa1268d88a850c708b6ba09e00bddd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://ebsenglish.net/_UploadFile/Images/file/35641898229.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ef0bab9---vanijaxerebudina.pdfIn PDF document text
    • https://activepymes.com/pub/file/fotofikutisalowixixadude.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mojomadolugijoze.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/20749531747.pdfIn PDF document text
    • http://nature-revive.org/files/file/wojasaxerapuvilow.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0f2de3eb58378b1e03d6c35706775cb/segati.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6amradkb9us4274bulj2t7nl6f/fufajute.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/94538096585.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b70a4591d---bimetefusin.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f88483c9d---47995802243.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c6feb5f062724b801cd779563272e823/zusizevolesivum.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607579637ebc8---21760864697.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fajakasukikexa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1413f804c5ed5f3b14bfff80bd3fad5e/89067800475.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/kokejaxagolukajuliwebo.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/14225541146.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bikutunomugufigakezotep.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912031759cf---20166558075.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/nagixedu.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/59410869529.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/gipijazane.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8bhp48f41f5vc2in8l191vcbh/jijusun.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/mimoletazunebivene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=using+both+formal+and+informal+assessment+toolsPDF 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_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 17500 bytes
SHA-256: e0ae45498c793632c574adb453a5caa7f8e1feefc62d9fad8db48d4f89d4f569
font_02_sfnt_off00016033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16033 10948 bytes
SHA-256: e6fbd23e3e077f52ff7e70ebbce17b108e0c86b7d75010d1b0f6d12c05524d4c

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