Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5de32448d95b89…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 11:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1c74165f0dbfd3c137ca7d7fd479159 SHA-1: 4c0f327d86632d7579536df28c0d53701f9e871c SHA-256: 6d5de32448d95b898fbdd4887694952b55404ec6155aa42ae571fee9a21029d4
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of link farms pointing to external PDF files, some hosted on compromised or disposable domains, suggesting a lure to download further malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bukharageorgia.com/sites/default/files/file/88560763740.pdf
    • https://tedesco.pl/userfiles/file/nutejinigasowenepeker.pdf
    • http://chafewyuok.handysociality.com/upload/files/58124246342.pdf
    • http://hitecds.com/userfiles/file/rirenikag.pdf
    • https://comtraining.cl/userfiles/files/rafukiwemavixorumoviwo.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514d9ca461---rigurubepapi.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7412ad163920b17597af2eda0e3a0160/84620020277.pdf
    • http://abwfinlay.com/uploads/files/nekamovetodisu.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/fabeligutefogegiv.pdf
    • https://junona.manyel.website/images/uploads/medium/memufevokemesupukupikusij.pdf
    • http://cn-polylysine.com/d/files/83917943942.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398874ab9c2---42901977925.pdf
    • http://medicaldistri.com/ckfinder_files/files/givedoguretitokala.pdf
    • http://telektrans.hu/editor_up/bevokuvebakixefi.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbdd35181e---jopoleno.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/19440690331.pdf
    • http://spreewaldatelier.de/img/editor/file/63880712029.pdf
    • http://pure-chiral.com/upload/files/87361784783.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/83445531360.pdf
    • http://laboratoriologos.it/userfiles/files/45479584670.pdf
    • http://zatexpress.com/upload/userfiles/files/kilojetudidedekanuboxubo.pdf
    • https://glozor.com/userfiles/file/22335337836.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hellboy+2+123movies
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/xuvor.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_off0000dc3b.bin
2ba942fe8148d9a1bef6d8aa777639c9c595632602ff8a5ec9b3c9df409c970b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 18396 bytes
font_01_sfnt_off00010c25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16792 bytes
font_02_sfnt_off0001243c.bin
b3f850ad30c758c6c93f193a1167e89b49f960721bc749d915f405faaa170b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 10460 bytes