Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3a172ad270e12…

MALICIOUS

PDF

111.1 KB Created: 2021-06-25 13:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79d7e4cb98a58b4ca9c2af82907737f6 SHA-1: 5f608bf90939bedfd055a0cfb90a4c5f1e1e0ac7 SHA-256: 79b3a172ad270e127c2e28570065b65dbd7610ace998a84b3c60d106d0b9a849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b0bdbb858e42bacb2cbd2e17be7ee26/gebaxizaparatajumojejupa.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d432a990e3d---topoji.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b41d9eb52---nufobulam.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/biwumegasoxatip.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e82224e97003b6ee8975c20584385a87/rodewowefulugidufagunatud.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ceb6ec8e6---toxizar.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/28225606955.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f7e8fb62---nogawerina.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0873aabdc82a6068fd7ffb7f31fc6a9a/48489132684.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/sobexogadenudet.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3d3abcda320db24db6256a8d36c9e033/5582680866.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rafadidubikukudedolok.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/fd38937967492f21ec0bd4ec9bbb8aba/31448365258.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/mumepamebogodenosuga.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/18595444913.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xarivoxoxuvugadugoledi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/49e1033c39f3e8a72a9ab8de36a1ea31/80707836444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=role+of+central+bank+in+economic+developmentPDF 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_off000150b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B6 17708 bytes
SHA-256: 68f1e2d7b57bfb63e7598ed62cddb07fc8d0bdf098b6e39977c9a66d64332b12
font_01_sfnt_off00017e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19649 10956 bytes
SHA-256: 3b320fbc07b5a8e75053c7c550b60247f9185a12cf22fcfe79b2d2da28825f05