Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e710c58d7b8011b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 21:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ff7fd32a777927878ba76e943f0cfd4 SHA-1: 1f900fb692b3113bdec0b026d57e3cf0d3456bc6 SHA-256: 9e710c58d7b8011b461060261748d8c217d1e53037bf84c6b5a3bdfa73014283
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users. The presence of embedded JavaScript, coupled with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggests an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alansglobalservices.com/ckfinder/userfiles/files/fagejoviz.pdf In PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/68806383608.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/21128629777.pdfIn PDF document text
    • http://come2menorca.com/images/file/57921385796.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109230332265300.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/65883271384.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfcd6889ae---22622209166.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161303fcb94815---wadonewutip.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/fupomodiki.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31504028656.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/pevewamivatigigepenobu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2712c11---56850047965.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210911061523.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/balivuwozi.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/30393651431.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210910224925.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/giratam.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/3078457343.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e034a9f55---94564646015.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/sasetadifoturefevaru.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/vuvimiju.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lovoxuvubaditarevafonej.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613226f73cc78---15039304140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=keyboard+shortcut+chrome+search+barPDF link annotation
    • 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10740 bytes
SHA-256: 1c92a94cc658b51415c547ef8c5e9edcb809b7f82f892995eaf5243cc63a0f71
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 18484 bytes
SHA-256: ead3eecb5f922dd6a6e551697ed0ff17a0ebf27290cd4cfa28b6893f54cf7b8c

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