Malicious PDF — malware analysis report

Static analysis result for SHA-256 4704387d279a963d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 02:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66e239f58a5116abb8df83d5ceb9c7d6 SHA-1: d90594b891d4c1f314b5277dceb47e567abb9486 SHA-256: 4704387d279a963da108698d195e101b640bfa5e6a6c13ffd59382b1bbd5bc26
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a3f166---23198710578.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eee7cf6c6---sogenofetesiso.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624648406.pdfIn PDF document text
    • http://hkalc.com/userfiles/31618978159.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/o1qrn4c84mknhft7tafvpg08b7/31568669020.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160768810c7860---64484398027.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/26459955349.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/74652167109.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e54535f89ab4469fec35850006bd1b75/voguxe.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f5b5ae2ea---tugadu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/3779821172.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/52949316491.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uqqsck49h9rvrne4c2he5cle2b/vowulal.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d329c5adc---98960706409.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/zifibozimunenazub.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/86718917078.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b6eed0---95595821593.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/oqf96v2jjsve7tojuvm9gd1t8g/pusibebegulugujatenuzo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b3502aa4a---xojinuxafetesawofaledodaz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6b51104561961035344d56bb7864d7da/nuvaxaxenopinesol.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a9b2c04c48fdfc84703b1482a73caf30/podopizamepadebakoko.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9m11me0unh3eopb7p3kqjueioj/fefujisotakenorukinuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+sleep+in+the+afternoonPDF 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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10532 bytes
SHA-256: db55d3a159ebb7117ba442be2245263d6b7330fca8214d5110e4ea802b337064
font_01_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 17548 bytes
SHA-256: 66b7f452fc5e1f496c2f6b4487c2ccb41313655da32e5251e4ebf8770c57d453
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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