Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebb606752ce5d0a…

MALICIOUS

PDF

114.8 KB Created: 2021-07-10 06:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3d81ef97d3cf67111cfafd1659c192d1 SHA-1: 84d0ddbfbdd7932778afea58c5dba6720ced53f7 SHA-256: 1ebb606752ce5d0aa3ae8e80cd73784e69c920c608ada4eff4b614243a321c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely serving as a distribution point for malicious content. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign, potentially using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a50a7c4ad6b8c49f6c361bdeb874c27/merukiregovosuzobara.pdf In PDF document text
    • https://rubenoferro.com/userfiles/file/nexijiwe.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ace31e3113d51377a20b2f50c75fb7ec/88560823729.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/hbrapu5qgm64qpqmbcru5q40a0/63151942904.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210708_5CC8D43447EFB039.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fdfeaaad7b90148792227cb9d1adb947/53845399617.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/86539913392.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/16207533254.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/85503614021.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2ff4c552---63156349129.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/2941553011.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d95bb7b0f3f---wetiwamizowuves.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nomudapefedidonagafomej.pdfIn PDF document text
    • http://www.heksan.com.pl/file/31396796767.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841515c47e9---dajozi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c309054---9809450283.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/64f2594ba7e1c4a63fa63323fc5f4238/94599104380.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/23944157357.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210630_597B154F92947D03.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/gh62jah6g886dl1n6vh7nae3pb/likeboxiti.pdfIn PDF document text
    • http://erex.hu/upload/file/getisugavenizaledopeba.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/laloveran.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad24c29b6---81469116254.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077e34743942---50252306199.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/sumejam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=biology+projects+for+class+12+pdf+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00013913.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13913 16588 bytes
SHA-256: 82bd736fc889fa1079d575cc13b0a720de96a8382d2f2a0e1331f3c00f8abac9
font_01_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 17972 bytes
SHA-256: 73e50383324ed71d4044bfe2f31cece808b58aedebaebf319a82c12dd2e9a7fe
font_02_sfnt_off00017fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000197c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C5 2204 bytes
SHA-256: d6a3ec2304814ceffa1fcfa62540474043a909a5ef8cadca48b748506343db53
font_04_sfnt_off0001a1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1AE 11352 bytes
SHA-256: f0bcc70d29da4552ca8a139b936ca7577dd05603db2d08ce05fd95d6bcf7af8c

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