Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9c0b2b6a03a791…

MALICIOUS

PDF

81.4 KB Created: 2021-10-06 17:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e8205593867e12731c0d6f76571f86d SHA-1: 27a143f51ca1d72fa1c440460424d912e18eb8f2 SHA-256: de9c0b2b6a03a791d260881ece567bca6b0d763e20a17ec7c562f19f24d58c3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stdtekstil.com/upload/ckfinder/files/5196944929.pdf
    • http://enotecagaribaldi.it/userfiles/files/98660300385.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/lojupe.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekonetirozovobidewipomup.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/68699125090.pdf
    • http://automyjka.pl/automyjka.pl/userfiles/file/xodosila.pdf
    • https://bizimpin.com/calisma2/files/uploads/livivoxuvix.pdf
    • http://gruppocreta.com/userfiles/files/vibafudulalu.pdf
    • https://locoffice.ru/userfiles/file/69009454980.pdf
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614416ca24c22---vedab.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/dakujezojodilinazenobam.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161578f0e490a8---duzomilowunolapokupumulux.pdf
    • http://studiostocchi.eu/userfiles/files/lagorubobo.pdf
    • http://emannsltd.com/userfiles/luvegalivegusiga.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cd2904408e750ff9e3b8bcc5adb45110/5200063027.pdf
    • https://hbphoto.ca/resimler/files/mozaxuzexupikagizupat.pdf
    • https://digbijoynath.in/uploads/userfiles/files/gebosami.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bo6a644drisefjc8abp8o5941a/77685890080.pdf
    • https://www.suep.gr/ckfinder/userfiles/files/puwipefufewowawamapufo.pdf
    • http://xn--eyt274i.com/upload/files/gunosabavukosomipokatewu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dkhtlb27kmc6u6op0rr08btmt4/26381316377.pdf
    • http://polymer-optix.de/userfiles/file/pufudoxusikefojumari.pdf
    • https://cooperspick.com/files/nudanozumegusut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+red+game+download
    • 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_off0000d9e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
font_01_sfnt_off0000f1fa.bin
faa3e6c3f8e58e5c54867362050add30023809ed517a34a91ceb0666de0ff3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10412 bytes
font_02_sfnt_off0001095d.bin
d6dbc9b7664dc7bb81543196dc12cc772cb9997a13c5dedfbd8f62c5f2e373bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 18160 bytes