Malicious PDF — malware analysis report

Static analysis result for SHA-256 105b5d7f23bab0ea…

MALICIOUS

PDF

68.0 KB Created: 2021-10-04 01:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7bb386e89e7aba03b8a6d5f65703f2ed SHA-1: 8cbde7f7565c9fd6d004e0c1db39f3a9f5109e8f SHA-256: 105b5d7f23bab0ea01fc077228740451bbaf3cc516cf0c2c436aaec140ebea80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wannawwannie.pl/userfiles/file/wemutudujopomenevejimiga.pdf In PDF document text
    • https://clickbox.ro/images/file/kezedirapososu.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/neduwurorojamisusopo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8f1j4v5ps8mbc04dmbif46emh7/bajemuj.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/bitedepabepivoboponog.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/famip.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/371a6766ebdde9b37ed26a57ecdb2d81/rasazubesibeg.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/rozigobumumimumasadetimom.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/5504119442.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b25c531772ba232d71bb4a31cec6d252/zidoputogogip.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8r56hptnimdh7tbj7ug8qe31rr/22415029450.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/57130940647.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/zimik.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/17876736936.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109030847576937.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/wazabuwuwuzoguwemekoxetix.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a4ee2523f7749cf91cdef32f1813d38f/14035570347.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94aa0ab15---jobetevemototopavuripef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=water+cycle+carbon+cycle+nitrogen+cyclePDF 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_off0000aaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAF 16004 bytes
SHA-256: eae32c679874b573da6dfbb819a5262965f7a99f7172456c1bf483669672cdb6
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 10484 bytes
SHA-256: 6aa25500c936d072baf1f3c1777d55406e5cc2fd6aed2df96583652b4f85e7d3
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1