Malicious PDF — malware analysis report

Static analysis result for SHA-256 02842b21ee79f347…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 07:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b071347f1415e31dc25b945cdb9d4c8 SHA-1: 3796139eeab2cbddc65021ba63062fb8d90d5be7 SHA-256: 02842b21ee79f3474defd52d78d6897162584cce577110838bdd55e8262f6a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=futures+and+options+pdf+basics PDF link annotation
    • http://geose.ru/userfiles/file/30228380961.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/damigo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/51376063809.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16125107b18e08---fawemupipefug.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/35661806942.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/39122607033.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061210563836.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/61337630479.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/wudatefigubukaduvotup.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/wobiwun.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/5878110517.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tabidovaxowirev.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/15162068530.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a32ftjaf7hu32a2jk4jm4fldk6/gaboputobukakiliju.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41f5ca31b---lidilekelipefepelojedimo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ebb59199e6476841c80b851507cb7d9/49548550760.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/nupirobixajis.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759d916e73c---lowubosona.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1b30e6a338006e7a644bab171da8bd30/87635570121.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/44402525166.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a8165e696ab5fd924bd0d679266ffd35/97087279855.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/31553115458.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/13297252069.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/up98ih5clb57cdcgng0r25idch/vinuboxegarekalozinajut.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/75406909360.pdfIn 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://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.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 18292 bytes
SHA-256: 8aa1bb7a68bbf9f3e1cc5af5b7c3b92d598c7e3b2a0b9c378cf9ef0e8f6e256b
font_01_sfnt_off00011885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 10784 bytes
SHA-256: 8f7e1e2cbab88f6f2b1f480e1bfb64a1d47ef0eb164682262b65fe0e40cc4587
font_02_sfnt_off0001313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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