Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff2fc3563ddb078…

MALICIOUS

PDF

74.3 KB Created: 2021-06-21 15:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 48ef936556262e56679cddeb9ba839b2 SHA-1: 8c6bd3ed21c30bfa35daec4213db27a44dadde36 SHA-256: cff2fc3563ddb078400cc0226afaa3091cca85eb4767871c7bcc55b9591c619d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external websites hosted on compromised CMS uploads and disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomorecpapmachine.com/userfiles/files/mupuredutosaw.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/217998c28efb5195ca6c7b2acb2837d9/kufisovujofopoxosolepu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e4f8c0cee2427a721935065b6b6367c7/92499177497.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787db1586c9---33968446949.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3d8d9681ebe6e1562e1b8f200759296d/vinuxinebelisus.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/01n2e8vogvs63lhv3d6nplb120/lubujawazulelonijuxikikuk.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca619d584---75000585965.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b251b1a874---5749343070.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0fa72ba528490a10b3e8baceee0abcd3/27446682568.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/99630591585.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/21376941702.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e8291a8aedaf38f63e5daf3cb007b1a8/64385006873.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/jofagepujokapugowarufu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a7dd88e616784e78c97accaa9fbd5b91/gonenopasojuragog.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fefebob.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8b4ed607---76089013748.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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spiderman+2+gomoviesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 5252 bytes
SHA-256: 668dedcc722331017b8a7ca77159fcf55bd817bc80b30e3e11da505661c10e45
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 11412 bytes
SHA-256: 10442002bfcd32000e020d0b615c7c3e1e4d3fa6045804d5d6de6f5fa4e4b34c
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176