Malicious PDF — malware analysis report

Static analysis result for SHA-256 07db67c4cbafe7ce…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 10:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5ef4ca4de38281ee0205f4a3f5bb7a2 SHA-1: 16f0355740528473f910cd15871a9c874595522f SHA-256: 07db67c4cbafe7ce64fdeb35f4d3014d25c65305f496a26528285275775e0898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=norma+iso+9000+version+2015+pdf+colombia PDF link annotation
    • http://geodez.com/pliki/file/48171603251.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123bc54cb18b---94734098114.pdfIn PDF document text
    • http://generoussecurity.com/uploads/82930777085.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/18688717136.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/88352951008.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///10266225678.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/xawad.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6b8c8622acdf9b53ddbde4107dea0eb3/buziraninuweromuleto.pdfIn PDF document text
    • https://silga.ca/userfiles/file/12549202800.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fnte951nkglsc99vgiu06pn81h/62667635874.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/42124482845.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/coi72nuom6tc1uaalf21iqmf80/porazimesa.pdfIn PDF document text
    • http://davcpundri.com/css/file/senuwikefemomulip.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e4ab52e---30858345937.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/75383385662.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/fexaradinusokujofi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/69036291562.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/xabipedovifemaro.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/volenumezovitelu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9fd5c455---15818250800.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p1ngbj79oarb6213ue353dsv9k/bepexonusa.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/kewalafusozixepuvipofipe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0336c82d8389c76922cae91c83c41036/zonigadidosif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 11460 bytes
SHA-256: 3fed5a32e5f9db86acc8761b16786d129e34afbf8d36e769e77a5d7b7d831758
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 17864 bytes
SHA-256: 1a9f1bc14fb7a60ce7c5657641944af90931a6abc11ad9d3a437f77c8dba2711
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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