Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d58c657e8d4393e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 15:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be9f643fe0658c35e6917dab3740f35f SHA-1: 7b8d09b24ae548bd12b554174d2fde91a10ee232 SHA-256: 9d58c657e8d4393ed1db6c7ba36a4b8b326d415a42c8dd7dc76b495eab40f66c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document has been identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely to distribute further malware or conduct phishing operations. The presence of external URIs and compromised CMS upload links strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=how+to+see+when+my+followers+are+most+active PDF link annotation
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/jgb4bv1fuermsph3d0dfsb839e/sanixesatinovuvobolufikup.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b246d69d---80946540520.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xawowewikulozejijibi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1bd45afa6c9fc70916d8e8fd76201ee7/vunuzozokaw.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/bivafuged.pdfIn PDF document text
    • http://benrassam.com/uploads/files/81398719997.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/32403975074.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/88140577420.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459aea3462a---bulezodato.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/44980706161.pdfIn PDF document text
    • http://www.pvvc.cz/files/37841116063.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lesisibojelazazijuja.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/miripijixebosuk.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/46893482100.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/68541440225.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/63191807684.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/gobevepekobulatasudubir.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/21671539448.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/69874625853.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/gitojin.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/riwom.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/93348737052.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/5701386844.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/siwedimi.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/69663566952.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/repuvazesewuxa.pdfIn 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://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_off0000b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 17928 bytes
SHA-256: e00c4ecf5b7725f40360c41209d424fbe514653163748630647426b9640c2b17
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10856 bytes
SHA-256: aba957cb647e413f85604cc63f0d86ba543cb6e833181c06336989d0dc7f34f6
font_02_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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