Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3939541a3ec0d7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 16:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2cc5daabfc1e93ecc8fa6919c80564e9 SHA-1: beb03304c1f706f02c088a10f6a286a6b1a9b0d6 SHA-256: 8a3939541a3ec0d75f74bf8a8f5b71d7dcf0907ef519e2228f1ce96de91b5b6e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious sites. The primary function appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/fedete.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c803b1e82---begonegeraxolatifep.pdfIn PDF document text
    • https://istanajp.net/contents/files/rozajogip.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/gedate.pdfIn PDF document text
    • https://edarky.net/data/file/zaligubera.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/24407697220.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/73367121087.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/1366748300.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136746f59401---geparojekaf.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/85378845466.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/tubexokubepafetopijowesow.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/vogojoxoxonufiju.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/37030905072.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/temavunurasibota.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/60235902466.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/15117196184.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/47537669929.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vavifivolonaxanudumixu.pdfIn PDF document text
    • http://ailizia.com/userfiles/sefebilaz.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/57908764590.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/49535739091.pdfIn PDF document text
    • http://arablift.net/userfiles/file/rolij.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab32e20d9d---zexoravuzunamovizabe.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/90650899792.pdfIn PDF document text
    • http://husplaza.hu/editor_up/57253892927.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tixutawasigekalona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4k+video+download+app+androidPDF link annotation
    • 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_off0000bca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA4 16688 bytes
SHA-256: 1c8c78af9f9fe453c21507999ec582b94883063674dcf97245e4cc241a10196e
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 10344 bytes
SHA-256: e73c41ed81cf3ae72649f26574931c0a600afcc1da1459c2bbf67c8a3502193d
font_02_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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