Malicious PDF — malware analysis report

Static analysis result for SHA-256 1077093a908d3d78…

MALICIOUS

PDF

103.9 KB Created: 2021-09-02 20:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa694cc165b7ba7ece0db2a19b9c0fda SHA-1: aeba4eef48516730855bd973f83278f51c712e87 SHA-256: 1077093a908d3d78c5f149d6e614a537a5e8b88f48463d62ca6d1e6a82be0146
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092600140c88---madam.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/xatufabumugazedi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb569a42f2---zawowedu.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/36635934015.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/malobagogoseterawa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0a4b35710d90d78a4411e02946e4f26/mibojitavobafolu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/36896265683.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/22e86c49bf5c6e3b555d297e537d9661/kogabafavomadikogud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eaa42fcdb9c3f8c517777190b6e1cbe7/28325364168.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7a4e021d307b01de9326564110d96957/95290207935.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/bopexujedapo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/976e5088720efd6262e62c8c1dc585e2/jinobidobexu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b1e1708850478db8146310b830b9a91f/4474501477.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c900064f6a6---rawixabulatiwomisupito.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ec54d22e---fafozazakorefe.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b4409f4c090152e794ac9022ec3740e9/xojaturif.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/45298742515.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219085246098.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/93911476375.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/7155022608.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kgskk3i8arcq5r417oi1b574cb/xafiboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=trang+b%E1%BB%8B+%C4%91i%E1%BB%87n+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_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 36024 bytes
SHA-256: 538c8f69ef3ecedcc417d59f5bd5e27eb3335b48533476185615ad38528bab3c
font_01_sfnt_off0001605e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605E 10716 bytes
SHA-256: 86c41583159923f203b9fdfa4d2cf0b077229d4236e9fd38650aa4114cb728af
font_02_sfnt_off000177ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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