Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f42857b7d31619…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 14:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e32e90a48bc8b23fc3768094ea67324 SHA-1: 3797aafe9faa84dfe971298da9f47534db16409e SHA-256: 33f42857b7d3161976812757f97ef9541125fa3eacc8aa0bee3dab787eac622a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. One URL, 'https://pixomot.ru/uplcv?utm_term=super+bass+bluetooth+speaker+manual', appears to be a redirector for malicious content. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded scripts or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://pixomot.ru/uplcv?utm_term=super+bass+bluetooth+speaker+manual PDF link annotation
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfadd2317---kenikakitur.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vuneluwutonuxenetisu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/zizodibizevovupud.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/86235419812.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/20fd8d0ff7d3768f1382dd22f7a2f2e9/97687767091.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/20378815935.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/45715528670.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/majefabefopuzolim.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c144add5ae0---48724814935.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/95157694683.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dbh0n0gud6fua19lv3s7e3u8a2/daxasipapun.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/fasunakobaz.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/33556753870.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e950d1b1c---kusulukowinakikok.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/geguwamusixuzokorup.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb27f1514f---xonisipezavepexir.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a423cc87633---67787530054.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/95294006854.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4affcb3334f71c23046947d4fa3fb3c8/letexeraje.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/221f7863202233fd8bc5d6beb58b3d06/fowokirebabesi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210812/file/16287298633502.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926ffdac56---basofexega.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2ksut2b0j12msu3jpkkj6npunk/25204661665.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210821_80429D41925E99F9.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/23876652489.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/21425466292.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/16816086723.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_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 10832 bytes
SHA-256: 47344d02b92fc4fac26e44e60102b912619a3819f016aad4d226a3dfe4464a3f
font_01_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 17768 bytes
SHA-256: 85bc2c135c6f568c94389636bdd2319e87fb5a617478014e739238df61b1f34b

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