Malicious PDF — malware analysis report

Static analysis result for SHA-256 55faa3e6d103e75c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 13:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9675ce526885ac77719c3fefeaa8bbb7 SHA-1: a46b3c6d553c921e284a40abd54aa5e7ac7e9dfc SHA-256: 55faa3e6d103e75cb2391b1271a4610356e7d5a6e441243f2e74af58b6102703
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=seagate+barracuda+st1000dm010+manual PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/df21kv6b0018quvb997v4er1cu/23669754662.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/11047348993.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/gugovemibakufodagasolu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/20991231965.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/896017420694dc417961fd723df50ccb/70178437669.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/xuvepanipetigi.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/tetofexokisebu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wevomaxexam.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39910f61c---woduvozozulij.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m66vm63d2qj9bgo6j8tpbj25ah/17715049557.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202108270307365570.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/97699287481.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7c34a688---jomidetigazamifaworisage.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6e7e16410ba9a3242533fa29e04b3df1/laluriw.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/71878096719.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/segowojusoja.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259b601774---gobuwirejikibotivinelozu.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/23855965792.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///zipimepegupoki.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7ad5cef06---43184284078.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/94222897975.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fvfo32q9bv2rui4g7t2n61k99o/tilobodegetefusanuva.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/gajunitevozurepafogudeta.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/11783421441.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/72043171128.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_off0000b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A9 15412 bytes
SHA-256: 5b4259ab5f33d6a667151023c9f6da8c431c87fdbf19d4d2c842db0ee8b0fc79
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10992 bytes
SHA-256: 919a916f61f324fd660c5aacd3458bef441c66ed12af624fbc5ab847c24e8f7d

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