Malicious PDF — malware analysis report

Static analysis result for SHA-256 15973e804d3fc28f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 11:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a52ae4625cbdab2c7149173d8c9e9f36 SHA-1: 472a93ec620308e77ef9d851299ebe020983b3da SHA-256: 15973e804d3fc28f8b459abaf5aa271d41952a4026b3baae33291f5cc1bcd0dd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The primary function appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://newshop.jp/archive/file/jasaxek.pdf
    • https://y3stwk65l-mn9.com/contents/files/molenojuw.pdf
    • http://polkovnik.su/upload/file/jojelowugifegavojefaril.pdf
    • http://stellarp.com/userfiles/files/16152052667.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/rusoxevobenolem.pdf
    • https://mehreganimaging.com/images/upload/files/fupigimuwenidanuwadem.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/49677fa69a40a107a1da768af3736663/3703662957.pdf
    • http://billedbutikken.dk/articlefiles/file/87029046600.pdf
    • http://ccadl.com/files/20210910234625.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/39944439c54a1785ad151bd9c42fb3dc/vudomojaluvunimorowulifan.pdf
    • http://vrieshorst.nl/images/uploads/file/zuwalubuv.pdf
    • https://aynadakikemalizm.com/resimler/files/4787664574.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2671d1d7---15191027367.pdf
    • https://mwasafat.com/uploads/files/51492793556.pdf
    • https://krusomying.com/data/file/40218146666.pdf
    • http://lifebeachvilla.com/uploads/image/files/wipefokokugobiva.pdf
    • http://elsped.hu/files/file/74590478184.pdf
    • https://petpetmates.com/files/editor/file/bokukifexebel.pdf
    • http://gruppocreta.com/userfiles/files/juxofogives.pdf
    • https://bselink.com/userfiles/file/bobopujamaluwalil.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/migonofuzo.pdf
    • https://majubesar.org/contents/files/907430840.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bad+time+simulator+ios
    • 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_off0000b146.bin
c5141132d8a72ce7a436b58652763bc67ba365726382ddcb052047fdb051a2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 16544 bytes
font_01_sfnt_off0000dbe6.bin
f6dc0d1a75b0466e43606b35229214867cc1dc492746402da70d355824fa533b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10460 bytes
font_02_sfnt_off0000f3ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes

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