Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8fe0c2ad5821a5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1faee34a3e8cbb57162b6eb4e53a85d SHA-1: 6b472a5fd6961d3f81e1dca590968fadb9cf3e1d SHA-256: cb8fe0c2ad5821a5b715acc914e8390c348afd793a7e32696f9518c60d068805
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms and compromised CMS uploads, along with embedded URLs pointing to potentially malicious content, suggests an attempt to trick users into downloading further malware. The 'SE_CALLBACK_LURE' heuristic also points to a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=rangeela+1995+full+movie+download+720p PDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141149686ffd---vebegujijeragufe.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/vakozuwirufogawasamiwi.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/20356682195.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/fetotoji.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/26581857300.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140514ebaa72---nadovorogu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/35263092503.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///dejenuvokonomowa.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/05f7df5261ad06da54705ab5026d478d/44544787926.pdfIn PDF document text
    • https://go2germany.ru/files/file/vuromuzubobimubiz.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/22892532842.pdfIn PDF document text
    • https://anfauglir.com/images/file/bomivanomijidupirogurizup.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210906142345.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/49595760158.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/87895929611.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5ad621eb---74090390813.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/befowiwudom.pdfIn PDF document text
    • http://didula.ru/img/file/12303088644.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/88483457171.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc54d46149---76436908822.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902084716515.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/fezelamasiponenidon.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 11416 bytes
SHA-256: b2d32780e6bb57863120656b7a8bba3f2fb44fdfed3e73de6769ddbc6b49febe
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 17224 bytes
SHA-256: 4f87cf302e9589d9449e89fec30c9ffaba78419457b2f53f85cd2adbfad67f59
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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