Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85579ba432e5e3d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9569d883d769e9947a48864497f6f21d SHA-1: 0a3a375d14c601235e73ce20bb9f5fb31b8584c8 SHA-256: e85579ba432e5e3dd8263eb466e5e85281521d23372e675c4bfdef7db9d434fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8bc3ebfa59e8157630a907d13b589d7a/wobipifumabuwideve.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d562e4a81a6---kudud.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/semovowomoxojudax.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/jabifi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jedoporipelazexubebom.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082299580739---20890538059.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/53919744792.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/12d9ac4bb03d5f268d3e061f6b80c572/16566521378.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9ljnbirfhsdc68lggidna0b08f/vuleratikigo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/migasonivok.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/ninop.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/08a1f33e4be0a28c81845748b43123d5/85422210304.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1ee90177b8a4b3cd979864413221a419/69283189654.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ed98b74e10d54d2778929b32e35a85c9/30147764606.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/vewivurijujisewixutof.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/em8focl1pdcnd2rnhancnbo1tc/buwonudunonadelut.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5e57e66781562251e8be544d66e41f1a/14440337947.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/kawuxilupujuwu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gowozaregilewina.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3f5a082dc502c78a377cad99c0d0e3dd/90052967558.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lopebusav.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kale3eeb94enei7e82jsl8vuoh/52864663070.pdfIn PDF document text
    • http://huiking.cn/uploads/file/100331305855.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/judakuruputo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=first+time+dmingPDF 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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16816 bytes
SHA-256: f3d1f4cda553258a9d68fec294265aa2967685acf727b046bbb5b7888a4eae6d
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 10240 bytes
SHA-256: c2fd04ad9a03c5f105bc07db93a9a038990096f0945b217f8dd0561bb4a34906
font_02_sfnt_off000133da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1