Malicious PDF — malware analysis report

Static analysis result for SHA-256 043ba48d6af32579…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 08:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc9bad54d3fed541828cef6d432b49dc SHA-1: a5fc8372f6ef96824890f754aacd1f24fb02deee SHA-256: 043ba48d6af32579d51cfff156ce3a76b854f014a5473b8aef6336f370714cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=the+joy+of+creation+reborn+mobile PDF link annotation
    • http://sergeybazarov.ru/file/1580830065.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae133c9cbb---xisapofexafopofug.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142955154b89---ramopon.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/munumujijevu.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/jupowekubivudagejanaralo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • https://aspirans.com/files/file/67292079319.pdfIn PDF document text
    • http://ibb-online.ru/f/file/dobutavezifiwopegirusokub.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/fagavijobezatodiwigeluzoj.pdfIn PDF document text
    • http://espicycooking.com/files/file///48880104883.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/dowozanefovoxiratejo.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97312326662.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/xoliruwawijet.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/69967961858.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24866635516.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/66430868811.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/75484608223.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/5814919959.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/kakosiposokes.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e331784bb5f882b44c6a1eaaf5d67fe3/20803350085.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/budilulenomab.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/63804508600.pdfIn PDF document text
    • http://vucert.vn/uploads/files/99290297621.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/31693172284.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/zojefasadavejipuke.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 20004 bytes
SHA-256: 6abfc17bc9311258fa0911b4f9a75a877a39e9141648450e25a1bff1644fe01b
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10780 bytes
SHA-256: de3db86611c78b0860541a650da6ae84ffb98abccaaeac2a027aeb6c224fca85
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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