Malicious PDF — malware analysis report

Static analysis result for SHA-256 4930f0892928408a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85d05351c93e20a0c162906d655c2f52 SHA-1: d0cadc7a43066b5b585990bf598a0d399884b5e5 SHA-256: 4930f0892928408a0b8dd3f32ed8b001287538b53458d200452a4bc67315bf0e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malicious PDF. It contains numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or directing users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific intent beyond the presence of these links.

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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b450208e089---zubodere.pdf In PDF document text
    • https://marikakozmetika.hu/editor_up/najulibezefifotosisutate.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/dosokawuvomutiwinotagonak.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/61027650960.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/vigifi.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/bapufugewinefarep.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e09daf26---selilajaliwu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5ptsmhou0ujm4rcnfpes8q18mr/nijubizexotugekijofugot.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/masomonerarukeme.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/974bbdac908e67dd2c49fe633f7f538d/gabapasoguvo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5p96u0lu36a44iq8d6tvbtisa1/94001914686.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0bf3e31aa---litimowenuvusonixej.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/rasixam.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/91618645177.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d933d5ab41---gibisot.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5o401bhvhcvtpufgh175qs061/gadamuxoxugepola.pdfIn PDF document text
    • https://etimes.mn/uploads/files/midatonojilojod.pdfIn PDF document text
    • http://apple888.vn/luutru/files/xawikerafokew.pdfIn PDF document text
    • https://soechi.id/userfiles/file/91798033441.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072b88f3ec2d---zoxudidiso.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a981ad821e---luwujopifurizalugaregu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111f14eaf941---futeneganipam.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c958bba7659---zudevejegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=digital+marketing+course+outline+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 11156 bytes
SHA-256: db9f76bdb0afb43016abfd962b7d33b7fc7185ac4ca1f7c896d4a85e0d8e4ce3
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17632 bytes
SHA-256: fa73d7669372d8517639576ba692a915c2718764248559b5ca3cacf02069f708

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