Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe8ac6216ee6231…

MALICIOUS

PDF

98.5 KB Created: 2021-08-06 14:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d6f51943002bd379d817c862fedb593 SHA-1: 79b08c9c9633b4578ed6442b3712dc6f961eac3f SHA-256: 8fe8ac6216ee62315315a5701c38777baead0b7fb9cb563b3b9c9c1be5c96629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL indicate an attempt to manipulate search engine results or track phishing campaigns. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=download+save+data+naruto+ultimate+ninja+impact+us PDF link annotation
    • https://atrax.hr/files/xifawaj.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077fb35a5---domimowena.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/74202792984.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/wimidurobes.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/29880137460.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25de1242c---86972920105.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210718030804_5f81o2.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/xizigijedavozewirupidup.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/47569538097.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/qshhq7h7ddo1jaadbdrot8dplo/xovuxazokenopobawe.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xibigodik.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq0g3nuuobn2dkf52sm8b9etk6/vuratunapilevuzonokites.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/66434646827.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161055c43d79e4---gitixepoteripaxo.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C978E2951F8.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075621fefb96---35168329824.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/nejedaro.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/kn80u2q9qi9s8bde0dg8cfukcc/xorukugutukejiwuwev.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c6010020---19179899560.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/36401278519.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/jijalinatiki.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee23f1da69---rafowedexafuwovuvogomugu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079a50acd598---tunifaxetigasufurag.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/47087967415.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6cfe9f06f5ff3efbee78e69dfe94d826/sutozixepajanefinanuke.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/65631330455.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 17716 bytes
SHA-256: 179fc2ee2f3807d16a91e16aed9829d0d7bdc64f0fda3a9f33697f4c1902e4a1
font_02_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 11060 bytes
SHA-256: 6ec6cf653655cf554e04d902083e63f67639216f0f6653da03d5d27cdc96acac

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