Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13e55d50edc0171…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 17:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4e63fdbea9a78e1da834aaba9cfd0a7 SHA-1: 6fd5da8184cd1c56f8f867302208b1ac03647014 SHA-256: d13e55d50edc0171e64c31981579ce282c6162a862409cb303dc1cdb87cf8b2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URIs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://ketchas.ru/uplcv?utm_term=thinkware+dash+cam+f200+manual PDF link annotation
    • http://saluteebenesseresas.it/userfiles/files/82602492600.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/10911949825.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee467d8fb---tojagiketaberuvanoporeso.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/nokagukakenagagalakila.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16114b78dbc849---38991640889.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ee5caf68c---18055106665.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/79282595413.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/87647537396.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160707ad7521d9---48622018524.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff20009a867---75748156333.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/96630854110.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162744145570.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/79969fb62cbb68ab53a914ce1b457942.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e3d0dc4b---jugusopitojobikanonodo.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/vijuwiwutogegufugosaga.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vulokekilerutij.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sizuruwobefosuroxobunud.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108021843332684.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb857fca3ea---10163515082.pdfIn PDF document text
    • http://protok.pro/upload/files/31599726857.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/30182291302.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nijagukeditovokakuk.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/rewalexuxej.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611f44f25f08e---bozumetiril.pdfIn PDF document text
    • https://kenadong.com/contents//files/nelivenepej.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 11008 bytes
SHA-256: 5d72fc3f0d85e74f638d93a2ec562a9e6160fb66a359608727cb3c2a69827c3e
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16284 bytes
SHA-256: ed96195bb30b0fcf59979efcc4d3580ee538b47b66eaf76cf889242051cb5b90
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 20920 bytes
SHA-256: 87ff575388145d56169b7410d69b683c30bc2fb66f2cb199b760194a9d3ac71a

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