Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd9870b0d427076…

MALICIOUS

PDF

69.3 KB Created: 2021-09-15 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f09648103a2c36501255e365a735a798 SHA-1: 3793cd9f905f6b301e5b2a7bdb6cc57cd741ca18 SHA-256: 1dd9870b0d427076a3b7547d39137562e0021dc30f2dbe1f8be725ec27f4939c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to download content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The file likely serves as a lure, potentially leading to the download of further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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 http://huichem.com/ckfinder/userfiles/files/83459129832.pdf
    • https://usssecuritate.ro/userfiles/file/susolefe.pdf
    • http://elskup.pl/images/assets/file/vebivexi.pdf
    • https://balticstroy.com/uploads/files/35837064713.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/gaxokutilin.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161325b0797b16---disumumazuniporap.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef9821215---18328720714.pdf
    • http://theexplorerthai.com/userfiles/files/jejoragegerodosetosukora.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d2c281ec0781044b87ace1ea2342a922/79520003723.pdf
    • https://amt-alarmy.pl/userfiles/file/30020622644.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/nakikisepekijotevuwug.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfa11b9d4c---nijotomexoziv.pdf
    • http://firewheels.pe/userfiles/file/mivozepev.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf679d678---82574588834.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a945e20e58---95525633807.pdf
    • http://dsfly.com/uploads/files/watukux.pdf
    • http://printific.com/images/contentimages/files/83293411820.pdf
    • https://digireg.cz/upload/numekobiribararetatawizo.pdf
    • http://myhomeinparis.com/userfiles/files/48725779886.pdf
    • http://sangjeom.com/userfiles/file///72432745070.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/mufajerikiwuvipamudo.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdf
    • http://88cpap.com/userfiles/files/nukebonor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nba+2k15+apk+fast+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d406.bin
145cfc66bca8a03736679a2dc2a71fec5aa4016327c4005b6be01e34e349f94e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 10768 bytes
font_01_sfnt_off0000ecf6.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 1820 bytes