Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68baa418c35da79…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef5e37a1b2679ec09d587e37d0ae78ed SHA-1: f3ea104c60cd321397a5680e820eaf130d995072 SHA-256: f68baa418c35da79ac2b7aba6ec8953ce208cbf30f0389b14285c87b43abb182
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDFs hosted on various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiogiovannone.com/userfiles/files/gekinodoze.pdf In PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/ragujalatolutevipaj.pdfPDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167adcd7f8---pawotajonawakokidiruvu.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/68728227225.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141665e2f7c0---14971872535.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/duzizokojekudegibumakoko.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614114a571996---36587122917.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/segefudegi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fdd82db7a6902fddc6c992b680159924/gugedesan.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/binovobakuziwanimovuneda.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/foxewet.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/5954863538.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169958b76a---55445792727.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/33775103455.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/64812479084.pdfIn PDF document text
    • https://slide-bearing.com/d/files/20606056020.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/82504346356.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bukakunutoguli.pdfIn PDF document text
    • http://ecole.ru/text/images/file/20890419473.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/jelunufegonuzesigiguxeji.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/roxuvulewif.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/lovabalixefuderebirok.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rknacmlsqp2j1e1n65kda37c3s/foraninuzusimal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fefa+tv+for+windowsPDF 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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 10428 bytes
SHA-256: 79dd72f33540f457a8830988095a5772a01ca85760a7ba03fff145a2b2fe98e3
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 20308 bytes
SHA-256: ee61619b67d8a21caa1b622559929b86911351595606c4cbbaf9839b8384fa34
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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