Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bf5a0ba1e15faa…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 20:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c34db138cae6413a9dd9c518bea608f7 SHA-1: 19da6ea03a44909642a00133573beabc15af0168 SHA-256: 64bf5a0ba1e15faae17b173f3fce31f7e05064e0dd2bb13f249739ac81a2fada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mt-filtration.com/uploaded/file/107763208760b81f9ed57ce.pdf
    • https://aawyx.com/sites/default/imageuser/file/40504702891.pdf
    • http://renovfab-menuiserie.com/userfiles/file/49985315829.pdf
    • http://praguetransfer.com/files/file/94897401097.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ba24a215---45571815913.pdf
    • http://transfertrolley.cn/d/files/lidito.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/00bf5ad10ca48095c4cc016bfe1ea165/libufifigirob.pdf
    • http://imaginove.eu/data/Files/nematixagenokopug.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1a6e9b8e---raloxawinezutekepajimi.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071144f60f33---nosikagiv.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/67c3f642e33d4195216d016e0d39c2c6/rupadavekanep.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/96cce71b254ec4fda32736ed6e255b34/lariwofezesujemetez.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0d36343e4954ec6d16aa4d66de8a136d/76114890204.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208b4cae50---60499776553.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s5fvdctj49so910tm6s1tg17t8/28001015757.pdf
    • http://booklandbooks.com/userfiles/file/60746515489.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b548ea9d8---33899809459.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qlnh6o8hcst3ucqqj41eol53pu/sunujutevasonirub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=future+continuous+tense+signal+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef86.bin
bf5b58b3af3abdbc36ee68f79875548c1fa17a773ee414f964418ffdbec65d63
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16920 bytes
font_01_sfnt_off00011bc3.bin
a124f0f9f11df931d2642503d730d7dc970106e4df033c17f097ea5104f038a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10708 bytes
font_02_sfnt_off00013457.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 16792 bytes