Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f3a79b5edd35b…

MALICIOUS

PDF

96.4 KB Created: 2021-08-08 20:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f832a6deb33e5681a77ca553d5e1d3a SHA-1: 630654d4b30bd9923fcb391d3876562766cc696b SHA-256: be7f3a79b5edd35b5001361f4162a0c8434c8464af6066088214987e3ee5025a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a 'link farm' heuristic further supports this, indicating the document's primary purpose is to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://garglob.ru/uplcv?utm_term=norman+geisler+systematic+theology+volume+2+pdf PDF link annotation
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/52090076481.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8678793202.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/19567570095.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a4f4e7d8---51408676640.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c9ea45351bd638bd17b9008ffa9f4026/jeromawewonafanunumudaj.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/87407674290.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xilumupi.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/jogeloje.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zadobogir.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/sufimekowanirejo.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/24041757522.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/fenizerotib.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/8036707609.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/04832f60e5b6e389229b19e489a9c832/27390723342.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4915c439e3b69fa909878a8ee7f4a707/2917760580.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/juxop.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dbd89d056ea88280d0634db709308968/87252339224.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac4c3e8c9---85236146096.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/jasufodizonor.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/kuwopesogakutuvinolerowoz.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/23462a7239e98026b0a956d437f80b77/59219810433.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084169978d50---69631432515.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4eb707d61---59962064010.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/88423494397.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_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 11444 bytes
SHA-256: 2b6d21e3cfe10abf9e8518cb39f9b72489dad0fd5f7193cebaf9c07c47775272
font_01_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 19264 bytes
SHA-256: 7bb81ef794a782666b3c45e6df0ea87f584c3f9e12c093d4ae3ffbc8bc4e8760
font_02_sfnt_off00015a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1