Malicious PDF — malware analysis report

Static analysis result for SHA-256 b371bf3c5d7dc455…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 05:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e146a7a86c9a66bbc00bb3a023adb5aa SHA-1: 8adc8f0e58d79672dcd00ee6c6c957796c76815d SHA-256: b371bf3c5d7dc455960d570e92fec261a05a8ca3bf50c7e51fe6d820a99745ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, with one URL explicitly mentioning 'download nba live mobile mod apk'. This suggests a social engineering attempt to trick users into downloading malware or unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=download+nba+live+mobile+mod+apk PDF link annotation
    • http://romanasulcikova.cz/userfiles/kawositonavogibuzori.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/wovukam.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dja0u821527iit9sogfjq6mc6j/temimo.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630963762.pdfIn PDF document text
    • https://blogsma.com/files/menevo.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zawufipitef.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910225521.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910230429.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904050338.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb61f448be---75521829063.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/kuzarupoj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9c43d184---52154118833.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/90731719695.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wopotemu.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/53102101626.pdfIn PDF document text
    • http://195exim.com/datas/files/razedinesagatebo.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nifopaselabotepi.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vozulu.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/82568461795.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138894b7f017---2774926257.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/ninuwetepisovirexop.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/41863128411.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/58604867292.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/gaterilesidesitufopiketoj.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/bunewolivolusidak.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_off0000b13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 16764 bytes
SHA-256: c4857116d8c717465ec268d5d18fcacec1f157dccf2a3712b1e08467eaceed60
font_01_sfnt_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10572 bytes
SHA-256: 891a84aad496d40266827d6d5e241a1164afeb42516fe8423255914ebb773798
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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