Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6edd36a1788154…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 20:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f303beabeb498087bd637bfe811a11fa SHA-1: e20e407e154d871769cbdf4f8b576176666281ee SHA-256: 8c6edd36a1788154ffd6128d08339716ac62899a596289d2e36ec98803f2fbbf
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' or 'formcraft' plugins for file uploads. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1b116nc4q4vmr8j85jp42au4dr/66479186870.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q0e1vu7p5p1obgegao08p5t7uv/54123674302.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d6ea897c4329d12048ee296c97a4ad58/vufadipewelevotonagi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b624f30d4---12311101977.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/menupuruvonene.pdfIn PDF document text
    • http://www.centralperdana.com/file/2304626412.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacae114b8---jazaxefetakusolomumejo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/93883522950.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3120687a---zorotigazonexesugi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5a8ab973471898bcf5c03a474c46255b/67183465141.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609325e159e14---xekuwewotonijajejodupopej.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/66022427115.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/78854821080.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dba24987fa42a5deca4f62373c0ba784/23260052772.pdfIn PDF document text
    • https://inncredel.com/uploads/pipawowunudegibowuvuj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9340dee45765f75532fa438ecfb5e40d/mukenewaxikiragijut.pdfIn PDF document text
    • https://superpart.com/files/datiregaziwapanitunud.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088e52137bf2---60127323616.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1bcbbde56d9f60d07ef068718f00ff39/25952619445.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/58432e103b8a6672e28e90b33dc93b30/kikebaxipijalonuvutowezik.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/019c6ee2b86a3fb8c8dbf2a5c89113a7/33897495608.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160720e28e2e2c---pibeko.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jokojovonegexa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9915765ef---degoxojolumagu.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/zolodowizoz.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ntpek8ugq3prm0etvdojnuaui2/jiduzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=physioex+9.1+exercise+3+activity+6PDF 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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 11088 bytes
SHA-256: 5c514542111af952058123a543bb4d7dc8cd68bbc2132dea26c7b20a23da3b40
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16860 bytes
SHA-256: 1d6e64f4881d8c710577a2f4f442d29e60eb8522d1668c852df0aba7c382b689
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1