Malicious PDF — malware analysis report

Static analysis result for SHA-256 a580b5ba8e4fe4ae…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 01:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 202df4eb1b95a95f0a54ca299ac515d3 SHA-1: 717feb86aad5d45d79bcffe51b4e921dd886a24b SHA-256: a580b5ba8e4fe4ae268fb8eb0c22b6aaf71f148073addaf87726887b22dd10f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's used to redirect users to malicious sites. The primary purpose appears to be facilitating phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://interativacorretora.com/fotosempresa/files/wifubefokejoloj.pdf
    • https://studybrilliant.online/app/webroot/img/userfiles/file/18579526795.pdf
    • http://alnoorcity.com/userfiles/file/941582272.pdf
    • http://chromowane.com/userfiles/file/mepenexikajonuxan.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6d2335418f933a072115cdd36035dbe1/feteda.pdf
    • http://emailreceptionist.net/userfiles/file/17658836708.pdf
    • https://ctsgroups.asia/images/file/sisetaroxoxi.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/mowobivewopafoko.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e8227364---2253402881.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/bobumalukuwix.pdf
    • http://unseretochter.ch/images/file/77104286717.pdf
    • http://yoron.net/up/files/33881265671.pdf
    • http://rickgrisolia.com/userfiles/files/nuxake.pdf
    • http://vina2002.com/uploads/files/fanekusaxanajaragex.pdf
    • https://renetravel.ro/images/files/29053318826.pdf
    • http://aloisiquadri.it/userfiles/files/38743156188.pdf
    • https://bunian-co.com/other_files/File/lafepitalib.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a7f80f267f34b46fd0ee63538a6c4f4a/23319202697.pdf
    • https://ilonew.tasksplan.com/userfiles/files/79357059266.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8849e90af71d920176852939b3cced49/47557772506.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3onrs1fj9scltqqm519o0g4kup/63095320225.pdf
    • https://volnynaklad.cz/data/file/wezewetodajuwomejev.pdf
    • https://kotypsy.pl/ckfinder/userfiles/files/jesaxarebur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=assembly+language+exercises+and+solutions
    • 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_off0000bacf.bin
e2ca109fca0e399e323b4d493ecd24dd3786c20847251b993e049cc39e0ef1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 17200 bytes
font_01_sfnt_off0000e721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
font_02_sfnt_off0000ff38.bin
7f34286f43a219db5b05b505fcca6178fd96400e4f43e79ce0de165fc68bf857
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 11152 bytes