Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6ce342117a2a7c…

MALICIOUS

PDF

99.3 KB Created: 2021-07-17 12:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d283caa377cc541d1b29c1fd296488a9 SHA-1: 519716a38dd8c240af9b10f61ea1339369e2c561 SHA-256: fc6ce342117a2a7cf2fd6fbba2b17c569fea151d1a19b245497af0f6fc98bd13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwallendorf.de/userfiles/file/dosejadexefizezigokodajol.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/22034668450.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/64272535660.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160895bc1174fc---6823727464.pdf
    • http://okmarin.ru/userfiles/file/48521001404.pdf
    • http://17njl.com/userfiles/files/42639823358.pdf
    • http://mutamobilya.com/images_upload/files/98150392510.pdf
    • https://koncnc.com/genelresimler/file/xefajusagojanojobelum.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tazuvit.pdf
    • https://vansuloi.com/uploads/userfiles/file/33657345453.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qokr1h89g02oknir4qa3honpl8/rojopoditemabasepexatomo.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/sull1c14e5k20c9oj0mnhlb441/45019683754.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6911702a8d950d806ab5b2c0141b4c98/mamurewusidetapenipoti.pdf
    • http://clasesholandes.com/userfiles/file/verukolamalilezo.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/rubaruwiguri.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d7efbbda9f75c0fe3fe8e6eaad6bb2d2/nevojuvuxi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c295719f1---52980355028.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/79228231613.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13143a5b7---padozanasemokabubu.pdf
    • http://marinapogon.pl/upload/file/wegawobaxubibulamu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088586782a27---50620168333.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hp4f211drvajvjvkff1jgh677/wavofarigetemetetugak.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf3ce937ead0336afe2701cfd5595ee2/fopozijiwesuri.pdf
    • https://alate.org/admin/fckeditor/editorfile/rufomapota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=somnolence+in+a+sentence
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019f.bin
ccf0d7d1ea4beff6ac4ff069d70886311a70a2b7e91cc215d3f3308cf5e5208a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 18240 bytes
font_01_sfnt_off0001315a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 16792 bytes
font_02_sfnt_off00014971.bin
6e8a18b6c41a2cd943b568b28e315f03f5ca941167c7340e2dd356148b999c0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 10364 bytes
font_03_sfnt_off000160c9.bin
c94ef7001b26333b4d4a8de0f62c35483eec8c37d3f93a978042ffe8d6beee76
pdf-font-stream PDF embedded font (sfnt) at offset 0x160C9 18784 bytes