Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af3442e0f26a4dd…

MALICIOUS

PDF

147.3 KB Created: 2021-06-15 11:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0fa6de3206edcd83bfe65c57c848f062 SHA-1: 024c7c0ddbced5070bdc3435ee9deac75e8b5ca5 SHA-256: 1af3442e0f26a4ddac3b176f3a2dd1473be9f2124cd6b767818459efc4afc208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the PDF structure itself is used to host these malicious URLs.

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://cructi.ru/uplcv?utm_term=persona+5+royal+hangout+guide PDF link annotation
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160877a014ffbf---39455177192.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16099935d7f857---vuniwubujikibaroxugefufen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f90301b89---gejatezoluzufasek.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9b08a1d6763de834240054588a633b2c/rasowutukerawapulike.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bfd818cb---nofetasisegepuvutovu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc5292f75dd014c7657f6ca461a320b2/lotufusis.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b756bf356ccfb5ee5ecbf9aed5181f68/70967687965.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/00fbf575a1756b447ff14e0faf8195a5/jogokijikenixoxewivuku.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/48dd25c474e2b0afd4660234c6538673/ragufasizukavefedo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e50df50285d8b8b06711cf9451c65442/nijidemasipuze.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/leburivorebomifuvamide.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/68130727760.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d149048d---4541493144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF0 44532 bytes
SHA-256: 9f17a7b45385a1307f382839ec0db12b4c51f42b88b901c9bb8835df53e26a10
font_01_sfnt_off0001f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F717 5196 bytes
SHA-256: 94518dbceb10a4fd4c0cdeed09bf34903d45e1b9a641fc1118937c3d37b53894
font_02_sfnt_off000208b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208B6 12936 bytes
SHA-256: 2ffcf00dd7bd6ab87a61926fa6db51667d9a116bb9ebbf85aed3f8c08269888e
font_03_sfnt_off000231b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231B6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176