Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7fc4f63ff8f747…

MALICIOUS

PDF

100.1 KB Created: 2021-06-29 08:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90953bc54d1c6f5aef3401068a5dd8b6 SHA-1: 4e7df74ed0146756fed70d3e5386f940d633bdf9 SHA-256: 0b7fc4f63ff8f747ccc36aed3d209a439f018418999b71d74d37225afb508b95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pelesiuvalymas.lt/i/File/9766955326.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/28822778937.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc84d97805---wisozazaboneborixusova.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f2af100df7f0fe34684f51b468346102/nifesagaxirefuwaromem.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/n14v1uuejgkbghq2roklq27n8l/64331723115.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0t7fsgpfbfg95j15f28p4gck74/63962027955.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d1dd4b17---lidademerugupatutijebuve.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/186854256a7df3e411dc4673032867de/saruzuposej.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b66c626fd---19091441828.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/23167841577.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607983dee5782---80371405325.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/felabunalalime.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/60104436256.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e62a902f4---62228122242.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd8b57ad0---jogifinotar.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/kotutimiwagojeguxop.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/up1rq7af4aqviievj59bu1or3i/85498514881.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c8jl0v96ttjhb5aljhtlknbvb0/49582463180.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08d6b1e31493f840408cdf32b68ab47b/legemidatuvuruzisase.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5172e438d90370886ddc3e21ba2a9de4/pibomamikupu.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/pukarigeza.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/38702708501.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607848a9bf958---32150335052.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubapunimebasatifigaxes.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/volufibiwigesif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=patchy+infiltrates+chest+x+rayPDF 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_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 18064 bytes
SHA-256: fc0c2472bdb9259e994e7858b52dc0ea1f8301d2e233fee1f23e62f9042d2e1d
font_01_sfnt_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFD 10532 bytes
SHA-256: d43de51548e90bb9ae1016e7dc491903c913eaa72f7b470fae67b0300d1c208f