Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4660e1ed35b2ff0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 00:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b857f10a27299337a500ff28a5b38a10 SHA-1: aaf5212a42825dd0de0dbeb58a771bcd6c49df7a SHA-256: d4660e1ed35b2ff0282c13d81f60b67df4def55611b2ccc2bf8468bd771055f7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The heuristic firings related to link farms and compromised CMS uploads further support this assessment.

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://crysiq.ru/uplcv?utm_term=mod+apk+world+truck+driving+simulator PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161412ba6ac920---zogebawilurezudani.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/kevopebajokevofa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/099a417ebb5c6ca1214323b6b9052a5a/jureponiko.pdfIn PDF document text
    • http://www.77ice.com/upload/files/39536253557.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee71ece88---2817161878.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/kokamomom.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/13657674577.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/sobuwemisoguxorobegisex.pdfIn PDF document text
    • https://plasy.com/uploads/file/86157740622.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66345164745.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/laluj.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/kojojawewunisuzaregadofo.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/kuxemukupe.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109051338117491.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/23979144159.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/62643956314.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/zuwixijijivutemoxox.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e9c47dcf66b07badee3d34299b5f7577/duxamuwofoguvumabu.pdfIn PDF document text
    • http://elma1.ru/!upload/files/vebuzesagapadusamemu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d6c554---negekudima.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/82665913030.pdfIn PDF document text
    • http://ccadl.com/files/20210903103320.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/57394375078.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/nerepidojiberijijevon.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.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_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 16612 bytes
SHA-256: 21f6774335be2c7172098b8b709e2fa0fe91ad38de0c3663433c90ad225ffcf7
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11064 bytes
SHA-256: 67ec8a03100dbd4f47f0a0ac9223c222e4764d8ecaf9920903ed53130f68c151
font_02_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1