Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6fa19e0bc9cd5d…

MALICIOUS

PDF

87.6 KB Created: 2021-08-24 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc22189ec85aef1f84ca714137b9a24b SHA-1: c8f47e24d94eeea946c2a7488962632b555012d1 SHA-256: 7b6fa19e0bc9cd5d3ffdf173d7e600f7f2c12a0db09468222d77b4a136d3dbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=martin+luther+and+indulgences PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/42296010c9cbc6e2359a260a55c2e85c/21970855413.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/vetumoginoz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6baef1b1cb67da5e80938cdee5e72484/puwef.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/50607707852.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/4987773585.pdfIn PDF document text
    • http://superpart.com/files/52509666376.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lotokodumilakilu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2708ec9f68---wunegoparaxomimubus.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/7065830332.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/76695378150.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/58554176553.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782579970b2---gubugoruzeko.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/terepisamuzudukup.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3dd21372---76532685435.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098be2ac9970---zasuredowaza.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fd618a60---1665716957.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/23437162542.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/24186176038.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf84088ad---94554291874.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/89549307256.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/63990694611.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/94202536262.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b38df8f5f14ac814a65dbcfff1b8d9f4/nokuzelokodatimunubifun.pdfIn PDF document text
    • 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_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10624 bytes
SHA-256: 1fc9d1195d11de14681ee6c18d7a71518694bae6d2f87488f72f2d97dbbf599f
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 17000 bytes
SHA-256: b0ba48c9112df711a04e60455633ead602a6991a073c8bb96a18975204f4bd62
font_02_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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