Malicious PDF — malware analysis report

Static analysis result for SHA-256 39be789402a292d5…

MALICIOUS

PDF

99.0 KB Created: 2021-08-29 09:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 152e36676d1dd2b7c16366d605a381a6 SHA-1: 82c784caefed11202f8434e1b638563f6d355b4b SHA-256: 39be789402a292d5655bcf3d371978a20c4c3d0b06ac2981e6d0a2b564f8b220
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=today+match+result PDF link annotation
    • http://fonnepal.org/userfiles/file/vonuwekatopab.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/jabusodetaz.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/87290235322.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ds5scu17nhc1dmda0eoap6vbc1/84062727883.pdfIn PDF document text
    • http://lulanjina.net/upload/files/wejevexovoparejesovireku.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74968730903.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607443de59517---7479236185.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1352f95775114c1f2358cd608014b48b/38852759165.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/46183995409.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/juginizabiz.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/gafomafakomubepox.pdfIn PDF document text
    • http://splogservice.ru/content/file/5253713547.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/2797936381.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b0423898d73ad5a8b24edff6c57f68b2/24410569914.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0af251ade0107497df7a0656ee64cc5/mekidaleziw.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/iaakd51pltnp2k2gct9msd3p32/dafetifutopitegira.pdfIn PDF document text
    • https://altbuket.ru/files/23014205509.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607167d5a4c76---juganokixujojikojadowiv.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/40312223560.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/88514699736.pdfIn PDF document text
    • http://fedoro.ru/upload/file/garozanak.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/29907514896.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jibobenalojafefolebudanav.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6b9e7e5e8---gasaralasitotapog.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_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 20224 bytes
SHA-256: 9bea053ea6a7aa17d13a91134f57fcb35f16a4c6b2afa61820329403d51d792a
font_01_sfnt_off00014e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0C 10616 bytes
SHA-256: 52c7258415c76e8f3739286a32702dcd423dbcd8e5c17ea80a431908250784de
font_02_sfnt_off00016666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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