Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e4569d02bca904…

MALICIOUS

PDF

83.9 KB Created: 2021-08-31 02:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1bdee43c47bfcb666e757c2402b4d18d SHA-1: 8f0338220acdf09703e0ba54cf8792f5d78df890 SHA-256: a4e4569d02bca904ebbf24c30f2f5e982a41c8044c94b5940552dd69dfb56c88
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable websites for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.polni.si/Images/files/bikosifelosowelun.pdf In PDF document text
    • https://firesystem.ro/imagini_ws/61725223806.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2f1706761c4507ffb9d13ee513ae41d5/97396415838.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd6023c26---lijolitabi.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tafid.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28cba6b22---malil.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lamalijapasomologafuwa.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/kikabolifovisakofodosinar.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a3daa45a---belofaduxaw.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/waremetipunawuvokajurun.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/pefalagufalebaxorapujem.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7636b24b---37543297847.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161178bd86a287---13480781735.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/8b9959a0af3e76f94e4fb4297ccec532/66096194946.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/6683547640.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/9en2rqt1okj5o8ojir9jkrnmm1/70548632282.pdfIn PDF document text
    • http://quaint-house.com/59653094820.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/97747690685.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/81480528638.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/kenejif.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/54933963700.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/98671608977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=causes+of+quick+release+of+spermPDF 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 17296 bytes
SHA-256: 19be94ab73331553acb140bf40116672d128c6c051582bab1156c309c6cf152a
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 10808 bytes
SHA-256: 35a4b7d99f365c3fb7ee38643d63cda67d62f7269636721a18d8af46e9cd847d

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