Malicious PDF — malware analysis report

Static analysis result for SHA-256 519a7300431c712b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 16:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a1afd51cb92ca9117d9c1c18a6c78d2 SHA-1: 45c40f5ee6982b1be89acd9f12266db03e5ded03 SHA-256: 519a7300431c712b083bfc4880fe76cb43b08d47d2b9ac26c518cdee204ca010
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the nature of the document as a deceptive redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://sdhmladavozice.cz/userfiles/file/42403393596.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/58200516223.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59509092358.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/23443195962.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/95586554984.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/71658710443.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bbb19fba---xiwuxumezapasuvidilofo.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/92535449840.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/50168298683.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/2486493247.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/20366014960.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/89438183363.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1cv76nmqg325fbb9h5h3upfdh4/31483904677.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/biniwozomawidexik.pdfIn PDF document text
    • http://lovesenergy.com/file/jubimomopebobusot.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jititirowajifurijibumul.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/zonoxalutoxukeb.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/wudibetenewebokig.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/99813559770.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/51808866462.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4e2e1ca91fe4399d16e72801f6638261/kaxafavetojepukeridoju.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/44523138554.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/91364929057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+app+for+gym+workoutsPDF 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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 11036 bytes
SHA-256: eab335f1ab412b55de175c613f57960a7da526e63eaaa9d09c584489947cc35b
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 17320 bytes
SHA-256: 8d7605df51dd73989fc4427b76d216023a3754f013d3e1725b1bd0a130e74749

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