Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ce7642b956290c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-16 16:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da0e5d4caa00ac5e89772f9cf017366b SHA-1: 03a3a29ac30b7aec7379753126b8bed7903692db SHA-256: 23ce7642b956290c3a3523ca9198968f38519e975f8519cef35a029cb498dc82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and appears to be non-readable content, typical of malware-laden PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/302fa7e1bb6d74a6e3f1a9d2d8ace04b/78140311584.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/suvogewi.pdf
    • http://ingegneriarossi.it/userfiles/files/59124562040.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070885e28b71---98927769660.pdf
    • http://thedewakohchang.com/image/upload/File/2807369106.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611881641dcde---66858030337.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/eb8f577c330e439db3a27a9c305a201c/85662268751.pdf
    • http://fsoa.cn/userfiles/file/36846624267.pdf
    • http://gld-lining.com/user_img/files/76643970181.pdf
    • http://atthaya.com/file_media/file_image/file/pezawewakugofikefuxanajom.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/pf74ko8bpi3krg0pu7dgdq8uhi/vixutamubafelixisuvafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb981d2ef2---7398711064.pdf
    • http://handbook.hu/upload/page/file/wusabibumoxenatebirot.pdf
    • http://prosquash.by/data/zadozasujonuko.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/653c902f632759155a36f2a589976235/dipukikawiwim.pdf
    • http://khacdautron.com/Images_upload/files/lixasajiwozezofevusulij.pdf
    • http://czdashan.cn/uploadfile/file/2021052320111573499.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/65321717218.pdf
    • http://vanhacollection.com/images/files/padivuxupowawi.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4v9a5i4k48do8ieasal77suhd0/98569619223.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f366b7b5e---44801855646.pdf
    • http://westernstudioservice.com/admin/userfiles/file/lusefatabul.pdf
    • http://cecev.com/stockages/files/xawumoleforagisal.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f0d0b168---19435337682.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2d95676462b35fde7f46bb5d6a45ac63/20095297648.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160861cc42de82---4208729689.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+long+does+it+take+to+put+together+a+weber+spirit+grill
    • 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_off0000dee8.bin
12bcaaeb31a2603c5857a5953b8d449ea3d819b26d91e01eda11cb106c5b92d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 11080 bytes
font_01_sfnt_off0000f83f.bin
bd12ec6074612ef51d2dfde086d8b82da8e3c8d23ab3da4ba411e455ef60f257
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 18732 bytes
font_02_sfnt_off0001281f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 16792 bytes