Malicious PDF — malware analysis report

Static analysis result for SHA-256 39063b78a21f78b5…

MALICIOUS

PDF

68.6 KB Created: 2021-09-20 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7eac74bcb3a51ef05d214233823067cf SHA-1: 3a2bcdc81e9fbb309683b94ca4911ff766dc430e SHA-256: 39063b78a21f78b511c4db7a12bce80536d8d7817744fe6559274faa561e7eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including links to compromised WordPress uploads and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=kik+android+download PDF link annotation
    • http://taxfreepoint.com/file/82568359201.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gelepogupopepolevawuximaw.pdfIn PDF document text
    • https://dcimx.com/files/xejulabubagebegavodeja.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09b533e7f---lukovetuzus.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/62h23ami37ue5mobktcbuurpao/xijetu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1cjiv8fkh3j97cq53tan470j6/83625587350.pdfIn PDF document text
    • http://ailizia.com/userfiles/89224996768.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/79392571555.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vekofefizilej.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/molopi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8546707847c7a0e4c80e9b4bb776d3c8/nudujil.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jaburijogemigijiwukupopi.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/72538338854.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zovafidekupaj.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/82897510926.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/53001883028.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/xiwufixatavo.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/narobuzilewugavixomivujo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/duxinib.pdfIn PDF document text
    • http://goref.ru/files/file/52072923815.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/pujerax.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/18234620792.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371151c63da---gomitolinimebogi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/pizoxawufofa.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/82768034341.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_off0000b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 14844 bytes
SHA-256: 5d15af6b9db1ca087ae7df05db8e4fb27cfcddb09064bb2c233f90832e69f34d
font_01_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10012 bytes
SHA-256: 67d2f957ef97e7c994b72653fa8559d679280335aed07540edae5fa1c7b62d96

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