Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a09bea31d558a81…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 06:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65abbf32729171b5882587706acefeaf SHA-1: 95686938bf9327b48fdc2221f4d05ccf53d37ef7 SHA-256: 9a09bea31d558a81618f7f39d53ed5696c3f946c6de5b74f4997a7b944eb8262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://parc-hotel.info/file/livazirowoninixonirofamel.pdf
    • http://anjilh.com/uploadfile/file///2021050214563638.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccbf416b5---13609559458.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8brie6rurcmq4u7cvsovc449ns/mazasajepasoli.pdf
    • http://jamessham.com/admin/usercontent/file/43646949639.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0751ae408---38511415209.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa352e720---nafezogiwakokufirukos.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45d85b21a---lewupadinana.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/c7uco8ietva8o73fq770rumep3/27280594107.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/tovosotesumirejux.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fab0ec4f3---42521642287.pdf
    • http://minhvuongthuphap.com/upload/ck/files/gufogenesexo.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d60ca07c5c---5597793351.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/deguvema.pdf
    • https://nhorizontours.com/userfiles/files/60668336361.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866deb226ea---82042944924.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160757451576ad---lolabikexetavil.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e7205a87af42e39cb02bcaecfaadfac/20273790534.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa48a221f87---65092613284.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9dfc11aa5bb3b908dc51ae61a211acf9/87721871705.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dh35t7q8ea4hm82nhkvj0v0pm8/fetafe.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0724180a---27286386338.pdf
    • https://betenrealestate.com/sites/default/files/file/xavusuvipekikele.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/mugosemoguwisojozaju.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be79da60c03---43956432299.pdf
    • https://midasspa.com/ckfinder/userfiles/files/selavizonomezapop.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d35a262396d1f990c48806c910c9e65d/42316227597.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd6e1f12b29e0810d6492dc384942a73/bajiguli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kinds+of+icing+and+examples
    • 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_off0000f4df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
font_01_sfnt_off00010cf1.bin
aaa5e2cfa630443aaf3e56967164ae3a5be1ca28f4628ee9268dc1ae329f9c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 17436 bytes
font_02_sfnt_off00013a7c.bin
f6982e250878a06e44fdbe02b09245d4f59e9e41b7736aba43b2bb55d726fcb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 10856 bytes

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