Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52c406ee8dfbf01…

MALICIOUS

PDF

133.9 KB Created: 2021-07-14 01:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86725c1c92241bfa9f848165d25df571 SHA-1: bc693c01fac5d2149578b1a6c122b0ad1c6d8786 SHA-256: f52c406ee8dfbf01f73acbeadc790db0c7ae2ce477b578c9f957a3995864155c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or redirect to phishing sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/639adf69dcb55f636b3537f8653d1ee6/3078524495.pdf In PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/dexus.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/99145224926.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ruwupedes.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71330708345.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/95300fbe546d2bbb790837d217757fb0/39319802642.pdfIn PDF document text
    • https://aksusu.com/upload/files/33891027577.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/akgsb0graqqermds2p85uo3t91/59070316989.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c9308072d7762fd7e26a571a3afae09/fuzoxizebekimaka.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ef24fe922d1f292b17831f13d60c6006/zotuvegasariwudodub.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ecb5839b1097816afb737d3fe1aee350/xekinijiredazezaliloga.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098989e8a842---gikabulugefoj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/486b04ca1faba7a6abb2ef1aaeae3a40/jekojesilugoxizimaxag.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9aa3c305c652cb5c4b2650e1647930ab/59886613919.pdfIn PDF document text
    • http://ombs.ru/uploads/files/fazesakuliferiku.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8733de5ee8b1f11aa2bdc23ff64d7d39/kevipigasejexuwutab.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/losarozavapine.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ridurofifa.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/141929369423.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4qufff1fmhhog8cq4asfs7mqe8/limexefixemolin.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98722780741.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c1994197b62ba8ab1e9eae09f673ec9b/88395113853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subjective+time+definitionPDF 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_off0001a73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A73E 19456 bytes
SHA-256: 5f57688330e76df04545724b3edff9bd03f8780932c3a384f85cc3fb32a6aa35
font_01_sfnt_off0001d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F182 10672 bytes
SHA-256: 74ed658ad0016dea51d64f022a45cdd892082d017964a5523b6de68314b65c01

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