Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf6e17aed4f1935…

MALICIOUS

PDF

68.7 KB Created: 2021-06-15 11:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c296889f7e1b78f362f4a7103f4aa9cc SHA-1: 45726d31a47965a4eda756152a8665b95b25691c SHA-256: fcf6e17aed4f1935987e0cb419752fc4da7a8e09c97751bdcca7280e65ffd267
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially harmful content or facilitating SEO spam.

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://coretry.ru/uplcv?utm_term=paniker+textbook+of+medical+parasitology+pdf+free+download PDF link annotation
    • http://www.radio-kum.si/data/files/sulobuxanavojakan.pdfIn PDF document text
    • https://artbynela.com/uploads/file/bakemirusezuvobekukigaw.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210609171652.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mijise.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/94021144438.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/16136645144.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d315eaf453---laziwiwetapudefadef.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bdfbb3e5a03a5b17408e9e3b8061423b/45486888005.pdfIn PDF document text
    • http://zuche0551.com/upload/file/56878239999.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0950e7d046---lataxopasizi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac8ccb408---85423679244.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce36e93da---walinen.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ti7nc9c267tfkm4cfcp6dtb5bf/xugejizosavesi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/sanexanikakulojavebepit.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/76521000576.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/13891866432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 5940 bytes
SHA-256: c007e6d9aaccab05fa4a5db437a05d09f2cadcc11449caf9b73945fe268d7c46
font_01_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 10696 bytes
SHA-256: 7bcdf9d6d8a92e34043b122924918544526bd678664e4c371c69e57bc01e1abb

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