Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b1c7f9775a120…

MALICIOUS

PDF

62.3 KB Created: 2021-09-26 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c10fc1be153b90ab17db75b043937f61 SHA-1: 4169fb7c772d2bf4ffa2dce1d52569a9dfccd8d2 SHA-256: 8f7b1c7f9775a120dca5ec1cc7fdb6a7a981fbd12c4f94c02cd92645a098978d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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://stroykap.com/application/views/stroykap/userfiles/file/sebedodosejanora.pdf In PDF document text
    • https://diamond-marketing.cz/soubory/28986595582.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/gopilegasiba.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/19099379214.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/6226784591.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-20/20210920065033904485.pdfIn PDF document text
    • http://regcureguide.com/files/files/88693075279.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/7958181094.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/57322755451.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd6febe916---ritapiw.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/36273147203.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/kikopiragopidopa.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/11900429088.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/29362188730.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c7c8995ed714e5d2a123b47673a75ede/ludofiburapabifujami.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nowisigulukitimalarurupi.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/22518859101.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/88282616144.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d8015010cfca5a219b168087d8b22789/xifewem.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/12146651086.pdfIn PDF document text
    • https://ayurmitra.com/files/file/38455899565.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/gozilajazamavikela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+many+frames+do+our+eyes+seePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xewaduwevuxilurun.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 14884 bytes
SHA-256: eb8b51c73fcd73081de8554c9b43083208052ffee513f1591362d457f239ec2f

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