Malicious PDF — malware analysis report

Static analysis result for SHA-256 2651c9b0b200f4be…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 07:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 735e19378adb169c0d6b58c4281cc4ac SHA-1: 2838d28a50d1cc2220ed898792c98e94e702cf08 SHA-256: 2651c9b0b200f4be8c7ad819437b09550a2c31e7193e9003a2e95fd828e245fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lure users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=chemistry+in+everyday+life+introduction PDF link annotation
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809cffb694b---pakuruzimebisatu.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/nurokiviz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb8ca00541---47849988956.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16127740477629---53067646090.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-3/20210703120100951986.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/31021947116.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/85385138608.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbafa8beeff---8411594377.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/salaloxub.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/velepojarola.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/96db9923e45907dd26ae522d5c732df3/polisigewasigovokaxes.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e925ce233---94090142213.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jksbku5svpkq7o18cakib0fdh0/tiruzosovigefusobefala.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf668d7fe---bomumex.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7177f85c---bekuzimadoxokefarerufiwu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kasozimajutulepokirigix.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33a6a8842---3533206734.pdfIn PDF document text
    • https://angkalaris.com/contents//files/tazoravepokutojigusiwil.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/90232945596.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/26709eeb53a7c36108d4afde3b1f99d2/lutate.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/riviganuxa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/56e33d3a9888ef85cb901de9e1f2caf1/41514553796.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/vopevukali.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/guremigodufidolava.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/60508682622.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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 11052 bytes
SHA-256: 0bc340cede633ce9f097a53f49b48e796ce38374eb85339504a76473d57938ff
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 19140 bytes
SHA-256: 0fbaa341c195d0ad324a471257c44f065e6ecac5c546fc7bd67da4c97b1b1186

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