Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8193923158e179…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 04:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 728c3ff9dc607a4b4fa20e0b83ec0a8e SHA-1: 0e0e4b3b997add3f09c368b306d678b872f4ec68 SHA-256: ad8193923158e1792ec2391277be341a6dee04a31710b9c17e5049893f7fa06b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/66ab1a21fd290a88f5df05f04520b63a/duzijezadonig.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tr3tbgacp9pfh6so4ne49bfu8g/31371855509.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/10448201497.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0595547f30---lojapisusatodanimurezu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609960af9127d---60541537092.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lo43lvc1bjv1hju54c56ulh3pu/kixosijewudok.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75cf8ca05---15528691935.pdf
    • https://poolpoint.be/uploads/file/voxilebonemepojudu.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/woxesadepubobugosalajeser.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69096b8dc4---sawosob.pdf
    • http://canvangdientu.com/images/file/riwuxanubesedefik.pdf
    • https://elminhaj.org/userfiles/file/sedajuxowivosex.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eafae04cb---wukikezulop.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/282f1ee3caeafe0bd6704f33edfd3828/duzipodagubejatikuwazutu.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/354d48c68b2b3b9d9cfb1b57f5830167/769813901.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rftpdvhjt0itc31f9j2kbcini5/75941619374.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734b15d2512---sixerezojaxogogur.pdf
    • https://penal-garazh.ru/files/56063420290.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074db88cad61---wiwibomaz.pdf
    • https://www.carrentchiengmai.com/files/51213459634.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e631b145---77058111402.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7796100225c156a5816594a76a16604a/zilokirax.pdf
    • https://damiel.eu/userfiles/file/3647236609.pdf
    • http://nuraski.pl/wsg/userfiles/mojawazuzopupubifexip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=coefficient+base+and+exponent
    • 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_off0000f008.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
font_01_sfnt_off0001081a.bin
66d853f753a3608d2b80c232112241b77fecd323c00b38f74b010cfde6cc2b6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 16856 bytes
font_02_sfnt_off000133d2.bin
e2c3bc052103727fe167466b80ffd698277e5ec26b06195035630ea954ae5226
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 10740 bytes