Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6789dca18cf459…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 08:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd3b36c15f91422e3071570d7ba5c5d7 SHA-1: 9d36343781b13957bf2ff3a04ae17906b994e7f9 SHA-256: 3b6789dca18cf459ed5c729d6d12abd0f0af858dc5a07860367d640d2617268c
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised websites, a common tactic for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL targets suggest the PDF is designed to lure users to malicious content hosted on compromised CMS uploads and disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ozkayalartrans.com/userfiles/file/judiwabasidoxalema.pdf In PDF document text
    • https://kompaspt1.com/contents//files/77815708665.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/9gh8m5jr7l2kr9jerq222jto43/mapanusizuxibutunutu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbbkfoku7eg9il1c2hfo5tjmi2/41479533433.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tejegu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/97801568736.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/21289335098.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210727090031.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc56a911cd---lewibareseleto.pdfIn PDF document text
    • http://standdominica.org/files/files/kejab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c1e75f7e---9637718674.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66660750983.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b8efbfb2323826b82b8e50fa3f1f542/gujugirizupawarobu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65189480222.pdfIn PDF document text
    • https://synersys.fr/contenu/file/wamazezegokidegusidafazef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e751888f---sezuturokelekoviwesagid.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fe0c5bc95605154d7bcf0ac7e2736f7e/tepalawapen.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/larefosupirazeki.pdfIn PDF document text
    • https://renetravel.ro/images/files/rasoso.pdfIn PDF document text
    • http://vanhacollection.com/images/files/winesumokezutunasofafegu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094069317df6---dijaxulivotuxulupo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56868032b4cf846eaa130e1491cf8467/nezube.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/velusuribipadupagavov.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/78831225208.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e275c07506---92959358673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=draw+a+circle+in+gimpPDF 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 18720 bytes
SHA-256: 6eebb61a24f1ffc59126df1a0b646214025b9792a65854a6a4c3770c2d7548e4
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10420 bytes
SHA-256: efe5a6c2f7ca61900c2b2d785488cbce12d5c00cd2383e49228303b4a6d6d056
font_02_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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