Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbcf808208b26b8…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 10:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f632a0950355a02438be3a06b711c5e SHA-1: 882fafe14895fc6b25e75cbe64a61a274ba73a8f SHA-256: 3dbcf808208b26b8aa3d3c5f3884a7e78aa586cdad6db7e65a97dbea3c4d2b2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, but the presence of numerous external links indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://absolutelyneon.com/userfiles/file/3696655903.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e868e4403a---dogetawaletivozikexivopa.pdf
    • https://zbmbudomont.pl/userfiles/file/nivusudokifetovujufi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1279fd638bf39b41ca864d29574f9362/16547036720.pdf
    • http://farmina.ru/uploads/files/polivun.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0afe26a09b0d6ed7725099e7980d8874/29280552306.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6a157e8c3cb7a528909ed7698a743529/19331932089.pdf
    • https://medbillings.us/lightspeedweb1/file/60799329672.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/52923607553.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5f750fa8---jugalana.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/kumuxivizovevewane.pdf
    • http://asbufestival.com/uploads/FCK_files/file/dowimiluti.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6552661c3f249dea5ae2ee8827c264ba/71218092637.pdf
    • http://al-bandak.com/userfiles/file/lolututetowufuzifijurid.pdf
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/99349402421.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62def3f1c---misunaxabamarujumuf.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/zajuzedu.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/63359916295.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ed37bd97d0fb1c3df5f6f38989760429/gasedepalawu.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/1661195711.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ad4382e5---rizukokogisogok.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/93878050993.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hacqd3pvj0k452q5fcevc0n4h1/80903707463.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=toefl+speaking+topics+list+pdf
    • 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_off0000f638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
font_01_sfnt_off00010e4a.bin
2eaaf5aca464de73f811fd8219009dac72075c26e06df6cbc8a12861327c7c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 18772 bytes
font_02_sfnt_off00013e74.bin
5ab68afbd149dc59d2a1dc73a47ffa2a256bdef06856f7c077181dad2513b7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 10748 bytes