Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c14feecf851a895…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 11:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d0f2b8cf81ffdd00a6d18c17881205b SHA-1: 700894ea15933db5aa69c4f0c943862e806ae2cb SHA-256: 8c14feecf851a8955ca34217f0fe514270141be5a3ca9dfd6960f94ada9c22cc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

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 https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/24017540541.pdf In PDF document text
    • https://curewelldiabetes.com/userfiles/file/zezelotigevagibebixew.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zijenabis.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/javuzaduxinizisizos.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607656fea46ff---nujavak.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2ee7796e---22855435537.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/42902172141.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/budodawi.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/82095761473.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8d2d2195c041085232a93f852df5864f/sufugejujexuzilige.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/60937459826.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/35905073818.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/zavazesamegafo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kowiwovixobelaxo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/749272d3da692afed8a019b73b007c84/dapabesavobamebapusem.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/40101090143.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cb64d091b367bfdd3e5872e990666188/fexaximavobiluzujana.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/818dc734607d84d74129e21da1c838b4/98494334701.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/20147819624.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lusemixofebimoxodezebor.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8704a138---42135159111.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8ad3f0c021b13f53743c618ad1f81d7/43097807061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ballade+to+the+moon+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_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 10456 bytes
SHA-256: 97032e2e6105c1df8bc08a1697fbcf63b1d8f3609656a32bfb3ef7947c4ba7f4
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 17528 bytes
SHA-256: 25d048860fc9c538fa15f645ced44f226ee0a42f3dab482fc0746229573206e7
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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