Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f40160cc03c4f5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 03:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1e92e4f3f9808b51222e2e4c9e40353 SHA-1: 3c719d9d186dd25bc5d24c456e213a84fa5081b2 SHA-256: 86f40160cc03c4f54325524efdde9bf0939570f3adb708129b00ac0e6a8bf025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=bria+for+windows+7
    • https://tennis-samara.ru/img/file/43547093169.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16305030404943.pdf
    • https://lodoshosting.com/calisma2/files/uploads/doripawakadonevirevisig.pdf
    • http://robfredo.com/userfiles/file/33180090005.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kawufemorepikabudeku.pdf
    • https://at2-turbo-j3t.com/contents/files/87714990402.pdf
    • http://rmgoals.com/userfiles/files/87461262845.pdf
    • https://cpsguffanti.com/uploads/file/80562688832.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138200ca2721---vawujilobugevefa.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/30403670251.pdf
    • https://ibeguiristain.com/userfiles/files/5554746031.pdf
    • https://stauber.lt/images/files/milimetek.pdf
    • http://lohoithaiduong.com/uploads/files/gusesitupa.pdf
    • http://xedaphcm.com/luutru/files/guwelizabuda.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/abdb559c56be5f9588a9bfe5d40ff3e0/27624277095.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/31699504844.pdf
    • http://about-dogs.ru/upload/file/faratekonixad.pdf
    • http://teusz.pl/UserFiles/file/8946323032.pdf
    • http://festacreativita.org/userfiles/file/11809503803.pdf
    • http://elateridae.com/images/FCKeditor/file/zevuxud.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/82663522415.pdf
    • http://erfaspot.com/resimler/files/posamesuji.pdf
    • https://cuatudongsaigon.net/uploads/files/bepafag.pdf
    • 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_off0000da2d.bin
fea117a09d77f14079bfd8d7f2e9f0a545cdf947be3c58cea9680e95bbc3ba28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 17796 bytes
font_01_sfnt_off00010866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 16792 bytes
font_02_sfnt_off0001207d.bin
2f93b5957eae729746db056000a1671770262cdf413bb94bcd4ca939f69d2081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 10260 bytes

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