Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca72d1c0b2513db…

MALICIOUS

PDF

82.0 KB Created: 2021-06-11 23:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e20dba0a1116b4ee2678294769dca326 SHA-1: 973f2720de2c58b372ce408305d4bf1b374614e5 SHA-256: 0ca72d1c0b2513db939b95cdb0aa111ec8e67a3a96bd14c13b66a5eb3da0da40
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body contains garbled text, but the presence of multiple external URIs and link farm heuristics strongly supports the conclusion that the primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=endgame+tamil+dubbed PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/40305862c74cf6827c733e241f95d928/12416264122.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/zagexob.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/makujipotuvexizozegazibes.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/45066816579.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/168fac99a223045eb3cce9f6c83ebf49/wogilirapolelipizejazejaj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb8a0becf---73852097152.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4p67n6fhg424nicq0v73ft1do7/jibozevutuk.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0669c5506---13496947997.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075eac93ee19---judajibiditexokole.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4k5i0krhbqkbaqnd7vhmkjvgtl/83256911996.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e0c24929d---nopunawejemabixibemun.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/pakow.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/78330074522.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdd1bf46b---paxalator.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1440b74f27cffcf01bd0ff05c0750c96/kovipusaluzu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e555ebd78889e8b63dc0b7076ea82a85/9888378884.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 4968 bytes
SHA-256: fa3f23b00617f5be905071c5a1083856e2384d80e0db09d2c798b95d4c8986ac
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10676 bytes
SHA-256: dc88da6e378fb14a76522075a0fa72d5b64ed9b75757f0b57c3b846c773dab03
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 10712 bytes
SHA-256: 3e00d51794cac821fc7a51745f48d078ef3501695d6e6df4d51fa43d1bd33ab1

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