Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a840de553f206f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 08:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41a41343c120fd37d5eac357ac997c3b SHA-1: e9d612b2c3632e2d709cad5193a4b054a6eb9a0d SHA-256: 76a840de553f206f094080915d4efe56662bf6e9b40fd503913cc5a7637d58a3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=quantum+mechanics+for+applied+physics+and+engineering+pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b67bca7f41997eeeaa537f58daee954e/73878343575.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/50937cb19578dd355cf1903af108f977/gipifowotobawafanupizen.pdf
    • http://jaatkinson.com/userimages/74602897005.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vnm3t70350aic71vqu0osrshg6/31209400843.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7eb554a9---lorinozolegugunivuguzi.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f4560d47f91f0344503a78f16268e59/ritogapadagizefun.pdf
    • http://lso-msm.fr/userfiles/file/vujefogotimanesezijikezo.pdf
    • http://shriadinathbank.com/uploads/nokeduguxeparuw.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/99bf26e67e421ef6f16aedfbe36ec387/jupitodawozefa.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16dcec69fb006db75dc61e98462b6c32/70089666700.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45be28bbb3---tabat.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f425aa1c---nefujerejeferalud.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/zejetaweg.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1c8b895ebcce056855b9611bb380d312/xolekana.pdf
    • https://selispin.com/calisma2/files/uploads/lufozozakulapuziz.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9d7f8e12f17db4d0e6dbce00829adaea/84160387728.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b483bda19---pudixipudubupobiza.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v75ropa7l6i0cfulnib0tb8bu2/gukajojagawabejakop.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8002bead56---kobaronezod.pdf
    • https://galerie-louise.be/userfiles/files/lonaparaxoxibozale.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077581d3efdd---gematodalajawed.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/23080806013.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609924cc693dc---kitejopedipuluzin.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/46980356026.pdf
    • 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
stream_005_off00014270.bin
e026410946195489b6ce499a413d05d5e4df08b329204de38a333203f9207ad1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14270 18624 bytes
font_00_sfnt_off0000e475.bin
d6f49cc0dae0dc2205df52966217a03d8f5831e32ce7ec537ad203ed0680f9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 11340 bytes
font_01_sfnt_off0000fed5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 16792 bytes
font_02_sfnt_off000116e7.bin
7048e5e9d68c5ea7056405cab95fd4aabe499e3e836dc2e4e25288c7384edeb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes

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