Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3462aa3768cd2b2…

MALICIOUS

PDF

79.5 KB Created: 2021-06-27 17:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 627e5891707839ecd9f77497ef6f3414 SHA-1: b1f2eb2b5b70d473cf0a48e8fbd87f71cfa97c76 SHA-256: c3462aa3768cd2b29c2bed7eb5febdefdf36efe684254a134be20119787f9c09
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0pfkgu27jmmafg8c2oh6k8kkuo/fepazapasemifaxufowoku.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/67f4c76cc290f8628e8128c65438ddaa/58139304807.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/877895ed4be29f76ee18f323b62cccf2/lifipojevuwobirisikubejut.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/53510316752.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97dc88d6c---nesijeribabex.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/20800290506.pdf
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/83026954887.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb4c20920---lejawa.pdf
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/56819302665.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k279e5j3ff6vk2v7qhmb69hsh2/fewogaguji.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb66e6ead3---96307397655.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/12d33958880b963e22ed1228a17d4b1f/1536324037.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4692404fdb06916fa2915b45fc593e50/sugiwalitizegovow.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/99392278820.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3713089548b2ea21ccd9ef7408a6c44/xidasaxopu.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/xukazitepofujozem.pdf
    • http://jevades.com/aircraft/fckimages/file/33718912287.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pc6nkbjab9a2v6gltlhd9p79k0/gizenuka.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfc47745d---dupubirefan.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d499e07c0b---77519035989.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/11d2fd0cce66954e06d6bc4c055221d0/52633216502.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/figafafobibinufudofe.pdf
    • http://aep-tc.com/cache/fck_files/file/votajalesubezumupagifegel.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc41fa6cc3---rulakogefebizabewi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+normal+size+of+endometrium+in+mm
    • 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_off0000d5ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
font_01_sfnt_off0000ee00.bin
5b216fce1d2b60c0f763f9724325572a9bdb0cc78bd2f6c3eec19965131bab6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16152 bytes
font_02_sfnt_off000117d8.bin
c91ea27cc6f87fadd85b334bd10fedf6c6b605398e643183585b9b9a87f75184
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 10772 bytes