Malicious PDF — malware analysis report

Static analysis result for SHA-256 787b9794ee2d35d9…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae532a0b758bd4e1e1ed16485b2446d2 SHA-1: 3908dfd7dc3d2db0f206092962a8a2743ea25620 SHA-256: 787b9794ee2d35d9548578f60980081cd8d0d91b6a568108243842bc4d29bd0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress upload storage. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f27871fd---ziwabatunakafepewiroba.pdf In PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/43162644828.pdfIn PDF document text
    • https://mashura.co/userfiles/files/39147390023.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/89968300951.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/tasobuzix.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/wofapofadap.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///sujefupagusukam.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/22538440107.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/31984792152.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912140601.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bomalereruvilafidepewumi.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/baxiwonuzavigebasu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wepejototizobajidubiduvu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pumomedarisateliweb.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130696dc2e53---zenibuxosivanosoxidatojat.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149614b45c40---45479367185.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/srr5ae2vah129b6suari7of70h/20086924256.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zevimix.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/56210008972.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/92733693265.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kavevobatokinanefimefu.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/89617402983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=k+means+time+series+clusteringPDF 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_off0000b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 19624 bytes
SHA-256: d0eaeda52f47c256409776c47427eb4b6de6a87fac4e8e0a1fc6525caf101c61
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10544 bytes
SHA-256: 62eba0eb8c8d1596ee90acf87fa3caf79c118c0a2a67ead4985e2d6a5973dddc

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