Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e344239fab259f0…

MALICIOUS

PDF

75.0 KB Created: 2021-08-15 21:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f31a3530b1740be27b300097d6b86d8b SHA-1: 32666f8e9c99b9b48e879870a0fd1348859dbf00 SHA-256: 5e344239fab259f0b18f07fc169a6fb1e1461067dae45c162c94a86a62c8f62d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://teormech.ru/teormech/usrimg/file/pivikukari.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6opuuu0ntsvrtqdeiaahhe4d96/54146414302.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/2637829022.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m0nlh230uion37rrdcmonoc37d/17652111507.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa12e8422---56757631868.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda136f3c8---nemevimup.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/wafowa.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/gupedagiwajurum.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c897edcf---sixugosivodawimeriwipak.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/8986802679.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9209d3917565e78b683e344b817c8917/72013354865.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/deimf6fsi1gjf81fjscbe286m1/37316069949.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9d93d832eda48448e49f99c39cc85586/32379792225.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a915f402a0b0e7057b8b8cf19d8c08a3/83671997399.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/134241193.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/39792095615.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n9d74r6aj5uvrvihv74kd2t3i6/16312439873.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2223c062f---gisekeviparazavatab.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9clvjr788id7309dvdlncrb4a3/zuwexotefada.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/74268083059.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/36168160787.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210617222322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=student+solutions+manual+for+tipler+and+mosca%27s+physics+for+scientists+and+engineers+sixth+editionPDF 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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 11492 bytes
SHA-256: c8d3174a9390e01d00e6f403f10ecef6102aea7be70fc710c1ce96d4660b1000
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16328 bytes
SHA-256: 132335b85d50d67bf04a8511fb9b8397e42093b829f04fc88dca7c0799b3c028
font_02_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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