Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf7b77e15961586…

MALICIOUS

PDF

85.2 KB Created: 2021-08-30 23:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 175a28247b2d34d5d65956a62c3f33f6 SHA-1: 8d786bbe73a9db3a8e5f3bd4dd5b3af060549b94 SHA-256: 0cf7b77e1596158666f032a81dd2479fbf7d9dc843307bb4fc8af6c3154f596f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests it's an attachment delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://odessawa.com/userfiles/file/53665612702.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/sagupikivuzaxefawo.pdf
    • http://www.rupankar.com/fckimages/file/gimuso.pdf
    • https://mygo.com/ckfinder/userfiles/files/47452809363.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/69809340793.pdf
    • http://sjar-tech.com/uploadfile/file///2021082319344454.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c9206ebdf4a3741339c1862f16e93197/supedoxiwubajifaku.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/90197740640.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/15801899149.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jidalenutajelavavow.pdf
    • https://shen-su.eu/gfx/userfiles/files/sukaxojusamazu.pdf
    • http://autosklo.sk/pictures/file/mepus.pdf
    • https://powermailer.in/userfiles/file/woguvigivifuwezitagasofa.pdf
    • http://atenngo.com/admin/sites/site/documents/67734906394.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0gvi76f8p460n5s1hd3j17nqk/wefukobotibabelalili.pdf
    • http://ahkjt.com/upfile/file/50082928770.pdf
    • http://scales-center.com/shop/fck_file/file/79409481248.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7570f45c---jotuzusubaviwuwiter.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/64d0b481aaddfd55202503b0364127e5/saperuji.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ce1e125ffb76efb79c5fbe1f4368bb3f/fesedobelereseji.pdf
    • http://iwilldoit.ru/uploads/files/files/pomafikijefufadi.pdf
    • http://bjsprt.com/uploadfile/file///2021051907173260.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d425c630134---pufuwiwav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=your+lobster+pot
    • 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_off0000e818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
font_01_sfnt_off0001002a.bin
d97223ae02c340f74751c8fcaf111483007be9380e9a66914de821c0d79bed1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 18392 bytes
font_02_sfnt_off00013008.bin
e2c0f0fea7f6574b60d1e6daaecb0c38f10fcdb17ac573f9bafbe36c15e3a1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 10112 bytes