Malicious PDF — malware analysis report

Static analysis result for SHA-256 16db8f0795377828…

MALICIOUS

PDF

100.1 KB Created: 2021-08-25 21:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7887a77dfce354fac0950ee775a0c363 SHA-1: fdab47595f26320b3901ed1da98594a1f973a0b4 SHA-256: 16db8f07953778280ec820700ff05717202a185a74a0d5b62018b31baca23424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://trustycctv.com/ckfinder/userfiles/files/23324983107.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4q79esgnis4fj835k4t6k0r8j1/91691781573.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/xetopetite.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b1e6d97eb0a07061452d37be293fbb0f/xodesusubagisipukufo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/eqjkgug86e6fpcn939mg1htd14/48394918182.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb9ce6089---mixozajobidekogogugazutuk.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/57650352543.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/52651512765.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/dazusufasemedolapuxat.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/60321446162.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hs9g5rsffu5kips3j4f39ovis1/43579103962.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072100324bb2---63226119934.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e05066b27---6076729939.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54c03df54---sigadimowogigatufob.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210816_1CC3FAA1D80E80DE.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/10c12cca49127681f44ca121d8efa897/18294544335.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/t8oh9c5d68qjqq5gftrb2daqmf/89599361964.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/68365720032.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/81671420219.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/zapadumoxolafatogum.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160752dfbc8256---wegudojosobazup.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bede2e206f1---23772120411.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bikonorumefexopoxum.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b180bfbac077d782f2fd9124e967675b/zimumuzovifojonuko.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasenotorepurege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kinetochores+in+mitosisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 17900 bytes
SHA-256: f8b426dd05a328638c32b5cedb58cf38177fb77803c86ea577cbea0453e3f82e
font_01_sfnt_off00014af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF1 10276 bytes
SHA-256: a4095e949aa63633588207912fe0778d26d59836b7eb381e87efcb8b5cdec3d1
font_02_sfnt_off000161d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D9 1864 bytes
SHA-256: 8c0d73da95b5e51f14280383f9e3ead9a6671e769f19688337bc0649b86c69a8
font_03_sfnt_off00016a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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