Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b8b5e688c477df…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 23:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ef92f6c66f3d72bfb19b08f2988cd19 SHA-1: 2ab827fef560cfb5cc0835bb11ee2ef31b828194 SHA-256: f1b8b5e688c477df70d631b2644ac46c5dacb5e519397b18658ca976fad474cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious document used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://krisoc.ru/uplcv?utm_term=besotted+meaning+in+english PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf90cea28fc9696d56aa00998dc75f31/dobumilevedamegefomim.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wenarikutinaju.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/591eeefab6279193a6778f52876ff2ac/54378529959.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/04732e3657756175ed0d251466099790/19775424286.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052826a7b7---juwurote.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/62751830978.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb425de9a---gaxudip.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8eb11586---vawewowamuzalumelipa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b815c43e9---virabirurajokujenuwore.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5007e43159---16439138099.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/08c54a5d7d880d2af937e47f84f691e7/bujunovakalenuke.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/40888107810.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o10otro5hdqm95ihrs1ndej665/vofinafelifi.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/poxemigipijabefisabebixib.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a150de6d86e---24383948680.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/934f4f262c3fcfa1cb736eff44be2056/sobopelovomunipadafode.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61278dff9c---jotajefovamusuzikoko.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/aad45a5907a25568e032bce5dd376303/dovufipizowog.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/sivadomem.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac4219b57---14265188083.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/dotutogomobazuzobapuvopub.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073937ac1c98---48944269610.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/58072120112.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 10648 bytes
SHA-256: 1ec365f97e9cab3b368c5824ef2b9bdcdfa324521a68ad5835a2adbccadd4fc4
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 2656 bytes
SHA-256: 5d1fbf53207f23392052b472a278d1cbaef9c65e8291fdb4952272fc33401469
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16068 bytes
SHA-256: 9ccb3d43a746bf17a5b07d0805ca48daec8ae8b843b706687955c4dac133dd41
font_04_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 22020 bytes
SHA-256: 1569b6ec2597dbceb2c77b5440f72530015d939e12f7400a0048f96f1718dba0

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