Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bfcab3cafe2a10…

MALICIOUS

PDF

93.1 KB Created: 2021-07-14 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8b6b9a7b1b87963ac019c4557b7d610 SHA-1: c53b1948e14fe1083ca79fe95e17f2c32db6c60c SHA-256: 77bfcab3cafe2a10e525993b17c491a2d348faa54987bcf1f105823303729d69
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of numerous links to potentially compromised sites strongly suggests a malicious intent to redirect the user.

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 http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf77881176---siwiwufefawajozapi.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kglhprmpcdu2uhqjkd0jcgrec2/41895790315.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3rpd7osoklfq7ivf1b7hjnm8q2/lifilusu.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/04259b2b82218911c2124ba5483ccc9a/94328422877.pdfIn PDF document text
    • http://atek-ent.com/upload/file/88399907630.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/96002490676.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ifq7t6rjfa1uvp832shgfa37a1/3121238284.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/linerel.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kulitatig.pdfIn PDF document text
    • http://abnicum.com/files/file/porowajukuxufe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4871043723085e70ed55c0a7b5004104/bukesonitupoxuwepumekom.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/68a0539a1bee391c66e966f312a3ea44/37269185366.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f2c59c57f---letezipinafewanaxagusan.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b5428b96f4c95c418e9b03921d105d2e/28393179230.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f2576194b---53488665005.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5172d3155da3cbff8d5c8573edb3959e/26433782559.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca48f83736---buwulalurir.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/gakew.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b94435f4f51690e5c0bf5375cbcbecd9/virikav.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b76d4832---wuramarajazi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bokog.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab2b925a---laviniwojivizari.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/50668074430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+print+secured+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_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 16884 bytes
SHA-256: e796050e16b9982fe2a43e20e2021221182dd2e558a6518e4a1ccf9d49190374
font_01_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECD 10584 bytes
SHA-256: 2cf76e43ea1a128e2433b6276848d4cd8ac6209f163d23d6b4a47385ca1b5dab

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