PDF malware analysis — malicious · b44bc2fad6fbab25

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 05:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 19cadabe107c400128b9e3c9960b73ab SHA-1: 2f03355a9813ede50749396651e4e40a0e44a133 SHA-256: b44bc2fad6fbab25e5a17627c54935d924822cdf1d47756236285f9f6734b102

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of many external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61499d5083---40918415803.pdf In PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b075d0b4fe9---nutebesuj.pdfIn PDF document text
- http://evola.it/userfiles/files/23463345554.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e66adc29---87202339010.pdfIn PDF document text
- http://favorit.pl/userfiles/file/kazurane.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1cc84c9ee27a21b4dc37d41845c02239/gasobewujadofenebaf.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b745a8bb1cc---16315033463.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bd199b16---6450603669.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/g4pcir9m8cdsqind4ni0r21ng2/ruwotavofomukuva.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/87973a940e12d8fdfe7ff5155695ddda/68351877618.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/07a499693d9bab804edc70f2ec4c48fd/melawusidopiwunix.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048ca28bfb9---8316550577.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tkdkjvs1krn6k28tbpvo5sn2vm/sekenupefesaseleja.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/90e5bd23d354072ca673a2d6a3ec0b3e/natumasebafezubo.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607586f372968---wozabazelogosib.pdfIn PDF document text
- http://esejsc.com/upload/files/xabibevakuvewunobupele.pdfIn PDF document text
- http://wohntraumgmbh.at/47682369580.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b75eaa1d450925abfc7e026dcff8adb8/dezuz.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/57105213109.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/050a8f531ae3002af37924db686c2e17/16733878798.pdfIn PDF document text
- http://nessium.fr/userfiles/file/68086459179.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f168d7676bdb78e6b97324f1d35106bc/lanuduvulade.pdfIn PDF document text
- http://prime42.ru/userfiles/files/89571828427.pdfIn PDF document text
- https://www.luxboss.com/ckfinder/userfiles/files/42433825794.pdfIn PDF document text
- https://harmony-lazienka.pl/Upload/file/95329979029.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a77d9d8c---motazin.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tipos+de+glucidos+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA07	19044 bytes
SHA-256: `3d697ac973369a03ed9e514fab425a9c7a3474504cc0354571d8d209ad34dc0e`
`font_01_sfnt_off00011a50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A50	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013267.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13267	10396 bytes
SHA-256: `f9d79b1a87ee192ee871877fe82aefa93a0c0d5671c92984e9646cb3ac9b5605`

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