Malicious PDF — malware analysis report

Static analysis result for SHA-256 656d52ba6215dfbb…

MALICIOUS

PDF

78.7 KB Created: 2021-07-01 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c78b2604ff2a4a35a40e5e4b57b67b0 SHA-1: 531e4486c484099bc0ad28c1d0415e928f24c08c SHA-256: 656d52ba6215dfbb04fedd77395f99f9d51af6c6b176158ab7d358bafe5629bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://topclassgreenery.nl/images/file/95729814657.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094450d87d30---zadebotezijafexidi.pdf
    • http://retco.ge/ckfinder/userfiles/files/kutopovonoxifovuzaralomin.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/gafojosafotexenep.pdf
    • http://email-database.info/userfiles/file/97187732833.pdf
    • http://www.kilincsweb.hu/fileok/file/31891710062.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/171fp6qanvgq73rfpr4tjks3hg/97787920219.pdf
    • https://banderlogclub.ru/Files/file/76053632589.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/nbs8spvsqmhkvuvlrn8bdd52ip/75794223607.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dovpai1if6s51sjt4ctlvc79u4/nedudedu.pdf
    • https://stratasphere.online/userfiles/file/xifefopafanaf.pdf
    • https://transport-vehicules.fr/userfiles/file/fofinovuwax.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cc622b51721706031a9c75bdd9e32ab2/xuroj.pdf
    • http://teechart.com/uploads/images/files/lupidonazefaz.pdf
    • https://zionapostolicministries.org/uploads/file/dakuzosujesudetipalejoniv.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6f703153---pilozakakok.pdf
    • http://dagmar-e.de/userfiles/file/33322229508.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fed80a5181f442b082ecf29bc4800668/nukozoronavewixudabad.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c5f48634---20243937650.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/52745829202.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f500641ff2e14aaf65c3db9806a7da14/roniwojurofexenov.pdf
    • http://efuegypt.org/userfiles/file/kijatazako.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0ea059a2---94840699077.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cff0af65758e314a56c127358af84391/73497820567.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/66938ed7250259048774fc8088d8a7c9/59243078670.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=science+reporter+magazine+pdf+2019+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce8.bin
e8252927d203021379ea323645c42270ef62db2274e60420d339dd6cb3d3ed0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 17728 bytes
font_01_sfnt_off0000fa0e.bin
ddacfb524034e669c8f58ed7a5ebea51fb87c772fe6b32c4bbce96bf9bff4516
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 11476 bytes
font_02_sfnt_off0001152a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes