Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d85c9316b9b862…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2252c1b28a93af3168563beabc3b0c9d SHA-1: 5c8baa5225615f34dd509478aa462153dbeaba22 SHA-256: c0d85c9316b9b8623c243317c2673b2bc2d4db70f8f2f765a2cf2557461c3d36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=tips+to+reduce+belly+fat
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dc16967eb---33528954442.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91f1c27b9---17344169920.pdf
    • https://dycmc.com/DATA/upload/files/202106140935428730.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de155e3a4---26891391556.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6936c4238---36255979477.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef98cf03c---bexagod.pdf
    • https://songhong.info/userfiles/file/72754420978.pdf
    • https://soudurelauziere.com/upload/editor/file/85076911430.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a8ac7adfc---fetutofotizofivapinulaj.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mlhva5ie1n6kt6joeh0cv6mrti/xogiwir.pdf
    • http://roxburyhs1987.com/clients/63080/File/38788017272.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c689af84597c4e9e297c2914a33bbd41/wanafe.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8opov88urrbk9tlkfgfffkfbfe/34392018390.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607484fa5d3cb---57555688261.pdf
    • http://adaviestransportltd.com/userfiles/file/fepademoruzi.pdf
    • https://dobre-akce.cz/media/files/file/50036977036.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608126d7b186b---88807626613.pdf
    • https://riondene.ch/img/uploads/file/refevivakudadisaw.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32d9be2490---sotogimebopejevimofofiv.pdf
    • http://trungtinjsc.vn/upload/FCK/file/bufaxazefofoxeragegopaved.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7be69a8572b6b1b667236c98e0d95659/53361950268.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b9e23716d6c500fd6ed700321766b365/45103289268.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f499cb9e3---63699150631.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaf4e3abe---nelukeguravavuzakegunewa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2b.bin
e872efb86e6b59233ec0166138c5bb9b90cb888df392f765e53215784259d959
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 10828 bytes
font_01_sfnt_off00011422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
font_02_sfnt_off00012c34.bin
7c1a3559af3dfd25e38b55420b8b7e5a9bcbb9c9f6cd8f4cc098162050a791a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 16936 bytes