Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eee1b695cd93db…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 20:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16278a6119fb587cf190e8d38d3b2a8 SHA-1: 0518bf1ab597c1a02978d491786fb16b5af2dbde SHA-256: 88eee1b695cd93db903fba015f108c1a23b803df496006491caeb37fa6c2e193
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/92e69ee805e30ef50a39687306da7da9/badafusojamulalizimodilaf.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775d3ac30fb---rowaporasidedir.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d32d1326---zarero.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7er0av6b2nfmrnm58p3s4qdf98/piromexorumejasotikezol.pdf
    • http://hum-lucknow.org/test/fckeditor/file/87923550138.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd35a39e35---rafovijijejuwadubop.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2f349a424---gepibub.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ed266dc0---fugubitomufovukevukig.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50211240423.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a541bcc20b3---30221633359.pdf
    • http://cezanart.com/userfiles/file/xekaribenejogozipedej.pdf
    • https://vivekanandbawwa.com/userfiles/file/nekozasafu.pdf
    • http://www.mostex.sk/files/articles/file/vores.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d1cde5cc0---48508356.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/14f8cf1ef98d26bc8252930799ec34ec/90833003997.pdf
    • https://przyklejki.pl/userfiles/34545142100.pdf
    • http://austria-ex.com/images/blog//file/93916709258.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ba582fb7---55687866484.pdf
    • https://mps-india.com/userfiles/files/sewazedelirevoganim.pdf
    • http://charontrade.hu/data/file/51321466655.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e18911b8f---tekawod.pdf
    • http://appartenvue.net/appart/upload/images/11051296945.pdf
    • http://ipceurope.com/assets/file/relegopedefijixe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=couscous+with+chickpeas+and+vegetables
    • 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
font_00_sfnt_off0000ef4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
font_01_sfnt_off0001075b.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 1696 bytes
font_02_sfnt_off00010f67.bin
48da8fdaba6cac15c53bfd9d43250d56354bd762d94fdc17ea4575eeacef116c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 18228 bytes
font_03_sfnt_off00013f76.bin
5763d5679085abeb68faf45c24eda51bc3a9134c42b13ddf1352faeab9c95fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 11208 bytes