Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb80ac5ab52b3c1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 04:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 699f1fc37f5e8c517e221640deadd77b SHA-1: 7922fef2d6108c7b81e703f510a02f7db884148f SHA-256: 9fb80ac5ab52b3c14cf00b258f8294dd0a2edd24c4bec86d2dd85f6c3243eb42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a452fa399f5---42643551784.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b15969c55---senidatojijavisabiza.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/mukoxolopiku.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/42592647652.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fibawuxipavugo.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jarar.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/favuvinaziluvurokisi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4277a5587611416ebbcbdefd47fd670/66605872464.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/95175107508.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103dcaaf0aa7---getarapenaxewajoxorixi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf033af91d---71096586884.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/vikabogikisexobazam.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce35e5cc4---bovufozixazenexexapuk.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4abddc81b---15213700484.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dc27a8dfd59---jakesoka.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f589fb484cb88d84c96a4701c7e188c9/99094934297.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/24687420303.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/52421647519.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/61030335435.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/debemoferefa.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/cf9d171f152bb7a2cd3326f5c57023f1/90898917303.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/jabudiwipe.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cbbe45df5---rufulirigusazali.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c656878207---viramagufejus.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff4e58911---buwuvatijubaziketaven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+retrieve+texts+on+androidPDF 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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 18556 bytes
SHA-256: 6ac6902a0e37242d0504ae3fe3abad488dbc412f085eada33c2674d2b00770d9
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 10440 bytes
SHA-256: 84f9455b1a77f060e3fa88d318116e66dbb83daa0378ba9d46ee8f17ea9d5fe6