Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fe2fc198052f41…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 01:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5b4e5471fbeff669bd73b662dbe93cc SHA-1: 7f8ba31d351fb86429476147783a935dd46faf55 SHA-256: e4fe2fc198052f416f045e6e5a69b6154a0bc5a8995d003c1348b4809fefd381
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The presence of external URIs and link farm structures suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/42a70fdacd6e4f317995e20cdad1808e/58921127946.pdf In PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/58093033708.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/984ec3295f1bc834c7086b6f5f90b613/79028260764.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/52024570858.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ki9kihhjm7i3aba95dsrekt60s/88134964860.pdfIn PDF document text
    • http://pk.mo/userfiles/file/73467586507.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/gifoxatu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e878de6e5f9f838d5bc9c52b0a91de56/33137354454.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/56080164667.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/89945827870.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077b106e08c9---11974479989.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6le39rq8uf6hr44hc3r52kfi32/61167860138.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/naxulabadotaxoguwoxewog.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/25215261626.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/delepamowobepoj.pdfIn PDF document text
    • http://kd-council.com/upfile/files/voxufelavikurozibisula.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/88603653976.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a640612c6caf7c9693027c79253008e0/12073705416.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607297022a32a---daneg.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/rapevefirolezomozevifi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7e2050188dedf6f01b0ffdf4e36c6a3d/10234886092.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/74271617999.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/abcf207a7805ec477b893741e4716627/tuxevapozeguvexowawunabud.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/14884735549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sample+reading+ielts+general+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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 10796 bytes
SHA-256: 8a50ec9512a6370a76c69a09ca65d381eaaacaa2bedac65f90fb44f9c0b1390e
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 17600 bytes
SHA-256: a7d5761903bac7f6954c68494e8535bd78f150a34fe6857c933a9b99d8c6453b
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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