Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e8f5898a7112b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 13:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc747bfa8fe14cad448db51dfbcd003d SHA-1: 5e7ae404b9afdbebfad60c10a55e68a069ac530c SHA-256: 953e8f5898a7112bc9b3f0c3ea11a562c153427b26c10513f92925ab71d39eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://irlanc.ru/uplcv?utm_term=new+gb+instagram+download PDF link annotation
    • https://calienglish.com/ckfinder/images_store/files/61881892205.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/kaxumejulobufu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/11107426170.pdfIn PDF document text
    • http://egitara.com/upfiles/files/mutelenof.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/77279026587.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/46879453437.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/serikilekefimalexu.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/83696904648.pdfIn PDF document text
    • http://sdes.in/uploads/17433839949.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614113b360e2b---xarumose.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b427203cf1f4ad3239800ea5c254214d/41818838419.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/89185625609.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jiwinopotegedajawi.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pogupedobudofomede.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/24792cee5b30acfe56880f351ed7d6b6/11181739471.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/zukewosapagez.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/14655171472.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/97167594253.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/56479192493.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kawakeradufonugofi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/41218887368.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/18217746146.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/tedugetasogoj.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/liputuwig.pdfIn PDF document text
    • 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16572 bytes
SHA-256: 8813624682d6de294358e7782dafbe380215f2b1eab5891ad24b28c95127f0c0
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 10792 bytes
SHA-256: 150238bad214025b43df1adad121f96660b773044d6ae89cfe07e3146817b2f6