Malicious PDF — malware analysis report

Static analysis result for SHA-256 85459fc66f000c2f…

MALICIOUS

PDF

83.3 KB Created: 2021-06-26 15:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1fe6ffc725b50fffb687f2f37147f4b SHA-1: c7db00b6d0675fda56e25a34cfa70bf0d63f2aee SHA-256: 85459fc66f000c2f6c77b9066ae6e2dec86ba808cd40a9b718cc689d9a358320
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://rld-carbon.ru/file/kivazuzetekaveduzabaxuvug.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b78e3e6b5---mubipoparum.pdf
    • http://marcobernini.it/userfiles/files/58991522121.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d0d3474392ee78d75ff31a793d414a44/27572446006.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074526666450---bevazaledibo.pdf
    • http://shosholoza.de/file/jojeveruliguxaza.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0b2bf6fe---gamikegixonunabi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a05eb78000---faxawemidupef.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35405dcca---rikumemadage.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d2d1c221f2e59bb0f4c672dcdc4bfbb9/zobapazise.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cdc6b06d10af81c80a1e3fac487a53e2/xiralasadiwuw.pdf
    • http://cn-junsheng.com/upload/file///202161793022725.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2c562813---98591968978.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/831mut2r672ojsf3gimcmad5lj/bilujifaf.pdf
    • https://airflow-skateboards.com/upload/file/xesokasudezokitek.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7a4948cd14b8a2facaddab3e7f5cc2c5/61286419659.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0d9d6d7382478bba844dd2713e314b10/sedewoxugubeporop.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cbcurh99d9obrke7ohc6o4ej76/77154885360.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7v4kfdb122kk17fkv0atr6o8v0/tezabisubimaninumetofunu.pdf
    • http://timandlor.com/userfiles/file/59173951256.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a435e051a---mekafobajegesive.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/41fe715e839424307a0f50f624811e4c/75356784517.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad070342f0---febonobapasibopere.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68454927439.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/303a932410b5cc6454fbf2af0c2723e7/waduxavubipabom.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/21416633166.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=call+of+duty+wallpaper+4k+android
    • 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_off0000cc5f.bin
7b4864bf6c110ee551ad31d3f667d3df7bc290795bcf72290ece0f7bc975a0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 17032 bytes
font_01_sfnt_off0000f885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
font_02_sfnt_off0001109c.bin
89aaaabf72fe7476424e0dcb6b2c9eb3ad779cfcb94994f33ee5c33c2f41ed08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 10824 bytes
font_03_sfnt_off000129d2.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16092 bytes

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