Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3f655033dbe3c5…

MALICIOUS

PDF

182.2 KB Created: 2021-07-14 01:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 351f3cc730670400689915c35fc5ba6a SHA-1: fb869aabc556459c619d706933c55bba4ecbd74e SHA-256: aa3f655033dbe3c54d62555cfe995a750a0aa657c74c570061384f6413816f5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host or distribute further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176a37f82d---luliza.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/fe2259d606b9ed515d0d0c64b0ac7c3a/gazofabigofirosesobi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/95066f82a0a0e90a472fb6b11ec0ae01/setotadugovodirawimamerip.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/dajuwepeb.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/n8pq5a8an6kcestk2i04jgam83/35262611613.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e45d6355273057635603f482d89ffb87/pugamovokixakojuf.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kofezu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34b3a6d7---nujutezuzikupejuju.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/jozisatekidokajowajiviv.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/9970691058.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde3d4539b---42873223275.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094428288692---37619304796.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694889d03a---rubogatomebekor.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/25131809260.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa17a59b3---25754393455.pdfIn PDF document text
    • http://flexa.cz/docs/file/10605945397.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/32836669698.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d005deed0---72597070185.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081080147b34---88555805064.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/27102424047.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/eb792d21d0f4dcac43f5611be77eb32f/pevedozezuguwoxixoj.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a000d04669---66243229094.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdeabd97d2---lolowusizojofemuropep.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/vafipozedota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+virginian+the+challengePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28687 17604 bytes
SHA-256: 5330691c7d4eea52d18ae3043e66d51be4c5b7fa7c51355f3b9b6a2baeced791
font_02_sfnt_off0002b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B45E 10252 bytes
SHA-256: 80d799591088e1aeb08b6e8e5ed21fbd70094d51d541c6d633166637a81a6ec2

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