Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef87feb2b57f0930…

MALICIOUS

PDF

78.4 KB Created: 2021-06-07 06:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30ce7eabd112aae71f16bb3ecb3b049 SHA-1: 0be1ae5179849c390eb3e79e39b8fb7dd765813f SHA-256: ef87feb2b57f09306f7ca4ebeded646c4f32394ff48736498aa12bf928f279c7
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be a lure, possibly related to the search query 'where can i read the perks of being a wallflower', to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=where+can+i+read+the+perks+of+being+a+wallflower
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec7570f4e---48006555730.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/d5evr5i30hvvo4qm4irsbl1blv/kapuruput.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072043a9b7d0---23312647427.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d79f3f8205c399cab8a52a41360cf938/8606092470.pdf
    • http://hzbmsj.net/images/upload/File/58669743467.pdf
    • https://africanresearchcenter.com/userfiles/file/91287701387.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/705136c5c4901bd13261488530b81f29/53863064530.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609314e0dd181---bixarafinaduvisotiza.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce4214cef---91094086691.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bd9m985a79m82umcsp97f0ba85/52393705857.pdf
    • https://kodcomputers.ro/2664/uploads/55703386102.pdf
    • http://meteosputnik.ru/userfiles/file/1426888846.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9236l7hlh1mmchhij0ucug6rnc/fowaxiridumubonosaz.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a3b92d8db2cadjvglign4q2bfv/debutezapuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d4.bin
77d2ccb56b4b2b2f4d7310524bb699fffd91532d8ea46f20487537cc117c3894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 5724 bytes
font_01_sfnt_off0000fc63.bin
2e2a0ac1cbf0755e91d864e0aef9463b15969a5a6605aac7b35e26c7bf7f58e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 1760 bytes
font_02_sfnt_off00010516.bin
db0a4ae8286f2f6d08090ed8619568f99d10429712b8bde816113cffdd42287b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10928 bytes

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