Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e20837bd8c6832c…

MALICIOUS

PDF

75.1 KB Created: 2021-08-02 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 477417ab9c19ea1bcc927b5a7e594be4 SHA-1: 3c79fa2f614cf880e5854da7311d9fcf8efdfe5f SHA-256: 1e20837bd8c6832cd255f34988f1a9fbad6428afa560bfc1dca8f88148657a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious activity such as payload delivery or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=pepee+eski+b%C3%B6l%C3%BCm+izle PDF link annotation
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/pidulesanam.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4f4u57jaq0dvrpfqhqpr4v0210/5373231519.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/13220363667.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8d1ab671df7f168e191f4bb5a5cb4f29/38151461898.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cdj15r1tct8d0ar7v4pu733ut6/rofudezupejogudofamib.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f45929f48d7d77e9cf6f527e6db83563/6922779647.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/67884759420.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/wapavawomupofuno.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ed95c41199b761ae67a99004d66aaf4/14867114023.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/zukewijovanewegusezepe.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0289c885a---58891413401.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b29edae8f---69139707052.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/98269093420.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/19591591267.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1c4dc87eb686a9890c43f430f470043/1504509550.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/sreaq3lkf390r4bi8706lramn1/dufelenututiwavuvatasuzup.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b1fc54bcb69c65f6f612e47dd0c0d8fd/44908715177.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6034df361---38135355766.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/11665527669.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/39160399899.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/nixotireporasomexu.pdfIn PDF document text
    • http://w-mill.jp/images/file/mefadowafexarukiro.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/mamarenobuxebefilona.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/50076374728.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_off0000c096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 10528 bytes
SHA-256: 30a1e70123edf982ce92eebf48aa0c0131664e390778a33f8eee5e8cae10b01b
font_01_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 18232 bytes
SHA-256: aa0c5f412148b833157ecbf46c735f8d329872eea14a7169fecd8f7257b5910b
font_02_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1