Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bff2763067a727…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7580d6add971c46c932ba23df3b67bc5 SHA-1: fb79e1f22bed45c76c8be572ac726963eae304c7 SHA-256: 57bff2763067a727f4317bdbaf807d1d987a65b203e3847524115838c9718816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://1mosref.ru/ckfinder/userfiles/files/66536602710.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa01125834b---wiwojoteberam.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21945576371.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/42731528129.pdfIn PDF document text
    • http://parfumland.sk/upl/kijokatizuj.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86897508231.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/wobereg.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210825092557.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcb1b6ce3---mosukedunulujabev.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/pexokefewegavug.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cb0ba5302c3db64cac6d5ee3c3114ee2/nifajuke.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/32250268364.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070864503052---wudugazoguvu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bda6a9ea---53792618723.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/65604447878.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/56439416770.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bevukow.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/kutefezodelugumolotu.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/9712886827.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210728144605_0b5b7d.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a497dc8dd---69514027819.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2be745d6---kepejelelezu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/zututorawavironimaporori.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zixevovomavuzedejexiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=housecroft+and+sharpe+inorganic+chemistry+pdfPDF 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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 17084 bytes
SHA-256: 93a20d610ba854a0b978b7c023c87bb2efac0dc8fb50ec1dee87865574d6ab38
font_02_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 11228 bytes
SHA-256: bce031a346c903d023998f05a60ff6a2e2cdcea5fdd56a976f2cded5fecebcd8

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