Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c53361a972941f…

MALICIOUS

PDF

101.8 KB Created: 2021-06-10 10:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f068a3ef6789598e82eb03dbe3458c31 SHA-1: 4404ff9aabd9cbff9d03e0b6fa115b4d73887399 SHA-256: c6c53361a972941ff85f342086ce980d13e1b68b47343da4e16ae088f86fca23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the structure of the PDF suggest it is designed to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=christian+songs+tamil+keyboard+notes PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/otg0pa4uo28g7eb07r5nhm5ge5/4155283416.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b9847ee5---zarakonagodol.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/44708433819.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9118dd32fd892f9b1d8a75592b6996ec/duriji.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/jijif.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e35f414ad---zemoriximipuzurixafi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160709f04ed648---nefidagogubupaka.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb00ed8796---bitolugiverepa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5172d3155da3cbff8d5c8573edb3959e/26433782559.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7afd5de17a---2950554900.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7ab4f41bd8eb8581edc1ebf9a357c8e/lubazuxufun.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f18a3f3ea---tagud.pdfIn PDF document text
    • http://ridendo.cz/files/file/9617427387.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jimisotavisuriwef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 5452 bytes
SHA-256: a1f233c1e0d6816765db8f2d4642f09bae780bcfffa3306f0ca3966bd694bfae
font_01_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 6192 bytes
SHA-256: e43b9ff3b8d3564a6998bd2470b01059d7784dd2d3e0e422f7245ece319ac969
font_02_sfnt_off00015236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15236 12708 bytes
SHA-256: 17e61fe055a35488294d78c54da169fe92c248a270768242fdc66f3bb0f16d35
font_03_sfnt_off00017ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA4 3240 bytes
SHA-256: 16f77be7e9bfd7786568f204b5c879f99d75aea55503ef8041910ca47928e4d9