Malicious PDF — malware analysis report

Static analysis result for SHA-256 759dc9fae75cb27d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 18:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad75a6e5733b87108a1152cf0551f7f SHA-1: ff15c90bfc14ba554b48f61adc00847cf757932c SHA-256: 759dc9fae75cb27d3a9bfa237617e6b60e92dc99717e30a86632761cada3e07a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs point to a malicious PDF designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://soudureornementalelauziere.com/upload/editor/file/mojozopibevaxubakikij.pdf
    • https://hyosungulf.com/uploads/file/gisoxajopirezituwuruti.pdf
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/xupemiwudatas.pdf
    • http://xinghui.co/upload/ckimg/files/202109060431257822.pdf
    • https://n-tlg.com/files/file/fosawupajozemawubunesod.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/tagawurobixut.pdf
    • https://venusnvs.com/userfiles/file/wibumakiwabapib.pdf
    • http://lagrupacio.cat/file/pejiduxaxaxi.pdf
    • http://controldellaves.com/app/webroot/arxius/file/35243200226.pdf
    • http://cpghollywood.com/userfiles/files/81483948574.pdf
    • http://nanouklid.cz/upload/file/31162937443.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7339ff8---kaluvidoxenaxupovagu.pdf
    • http://kompassztuki.pl/Image/files/serizawikevijavunuduj.pdf
    • https://prestinireedcorp.com/userfiles/files/newamuwomalufoxizuxemal.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/39636847514.pdf
    • http://tahi.hu/ckfinder/userfiles/files/63537124688.pdf
    • http://daindnc.com/fckeditor/userfiles/file/14507027380.pdf
    • http://adams-gold.ru/archive/image/file/barigogefadowes.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4a2a2585---48190420268.pdf
    • http://datavincity.com/uploads/ckfinder/files/bevavijomigugakerob.pdf
    • https://drisraadentalcenter.com/userfiles/file/73203366823.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5def52---jedati.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+chrome+extensions+on+android
    • 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_off0000d581.bin
0dc01470d31eb34650bb1792f1213630494aa5e5a9c24c37f7d361c0b529e6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 17712 bytes
font_01_sfnt_off0001037c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
font_02_sfnt_off00011b93.bin
3b30c6b3ad84f941d945fdd1793120943c53090e80145e0315886152a737a463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10876 bytes

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