Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d42caf75e1e43d…

MALICIOUS

PDF

100.2 KB Created: 2021-09-20 01:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00cab332a1c085f90a6f22f1cd897e83 SHA-1: 1d937dd8b39ead50801a9baf24b6aca4b6eadb07 SHA-256: 91d42caf75e1e43d6397faa13f1968e7a418cd48fbe0c66833f40be8be22ce3e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://szerecsengyogyszertar.hu/editor_up/76971386904.pdf In PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lexorenorowulo.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/jaxosubogegujalobekubo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/50858762629.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/23231222686.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/bafebojejazobagi.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/18236688015.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dmakp12oftnchs2i94qmnljdmg/rilolavorusamiled.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/aa5aa9400595b536c8f9de706c7bbb45.pdfIn PDF document text
    • http://charontrade.hu/data/file/48585493117.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6f6b2c1fbe032867e6b1c43203c3474d/70931611701.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/97190716067.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/84870043400.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/dufenuzisos.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/73089685230.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/12383654859.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/53527595789.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vajezedupudovibusekaf.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37114ed9f---34198682953.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/sorinaxibewofod.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/jarutoxafubaguxe.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908032258_1607039097.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wakuwutuluwulejofe.pdfIn PDF document text
    • https://ekransamara.ru/files/sekedidobosuwamufivirimin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=friends+reunion+watch+123moviesPDF 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_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 18520 bytes
SHA-256: d9155e4fec96edd0fb78fbbd9fcb9e119d87e2225d489ef78556be3364ca1c15
font_01_sfnt_off00015120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15120 11160 bytes
SHA-256: 7d657073a0046aa02c2894720a0dc68a81c275365a1e4967df3dfd79bd818747
font_02_sfnt_off00016b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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