Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce87d716d027db9b…

MALICIOUS

PDF

97.3 KB Created: 2021-08-10 08:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f33d7a63b313936f18522444548e37a4 SHA-1: d1af3a8e2214c5a3da77e094bc0248d015a297b9 SHA-256: ce87d716d027db9b8844e6c8fc04b711c09f48449bafe70dd42984f73960d4b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=nccn+guidelines+cervical+cancer+2019+pdf PDF link annotation
    • http://pokeocncafe.com/uploads/files/buxupapovutitidunutipuxu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/gifuvawovedalipajuf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac90fc1fea---vaxifuxumujitivubiwaje.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160714bafef19c---56326414639.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/robazofokub.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/wusarifelejuken.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/21337096238.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a2767460---90776629996.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_524FAFA94AFF7E79.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/26c7ebe0136c2c9ebb67ee64ca2ef326/pisaxagofovitosuligura.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/629ea527ae4069726eac9e2bafd320b5/nisamufazalofirob.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d6428aeb---dowenidejirimutavumigu.pdfIn PDF document text
    • http://classtool.info/upload/files/43579463022.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29142556350.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/15793359192.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/ruvebasipetolagizi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607475e5d7b13---45264859453.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/33487551564.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5873db41aad348a985e4574003b32635/sotiduvurelepirovesux.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc410bd77bc6005b6943c6020e18d0d8/boleget.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/rakusu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/joxiner.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fafotijila.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/logebokefilurek.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19a52885dc.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee842be32b---wosesogizu.pdfIn PDF document text
    • http://lukinserv.hu/file/9377969146.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_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16920 bytes
SHA-256: 4f90508355752274da5655d8916abceb39de05c89ff3c35d18a4a95e795911f3
font_01_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 11180 bytes
SHA-256: 09af5ab9f4fa48c8ac48cd3bf9316991afadcc491549c71351cdec0fcf141ac8
font_02_sfnt_off00015ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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