Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbac2989e360b25f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 20:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c81b899572a13475cdea1dc75adc3f73 SHA-1: 7d902b4f5404a712853c4df46dfadc95659051f2 SHA-256: cbac2989e360b25f3a667c9862174404df29d08b620e6f60deea7459eb8fb301
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=jura+ena+micro+90+user+manual PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/73482849dd5769c27a72b85abda60514/razijiketijir.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/zolofigavowopatukopozosif.pdfIn PDF document text
    • https://ultralloy.net/upload/files/87837556359.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xedurediwajo.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/pavokimira.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b09e9560513044ba847883ec93a4e1c2/3596004164.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/efa4b2d2677dec534a512c1dd84ed243/jatadivedurobuwoli.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/7590508420.pdfIn PDF document text
    • https://techlan.pl/files/file/38843416285.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/224id4pp54hrti9195car1mv62/lopexakusax.pdfIn PDF document text
    • http://patroha.hu/file/60076190374.pdfIn PDF document text
    • https://activepymes.com/pub/file/fejudi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608464042dbbc---12534724650.pdfIn PDF document text
    • http://apvn.info/userfiles/file/17566507604.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161301849e2d88---51978682514.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/95799338247.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/68a2ea0749663f09425871b3a75d305a/tutagawomezodamo.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/96700772966.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/376463623612ff42bea3b3.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9949a93f29---kilimulilomesizupezi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d67832e57c24a5a95a34264ab68068ed/17742095744.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f462b3b1a0---82228489199.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/tojow.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/16581567301.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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 10676 bytes
SHA-256: 3ebd3335418cc9d6ecc7ad747f6e106ee1fdb7d5bd7428913260a860ecde94ab
font_01_sfnt_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 15700 bytes
SHA-256: dce458200400c35ba9e79de8d40c4ddabd7677b04c0d4721bd513cf125700eff
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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