Malicious PDF — malware analysis report

Static analysis result for SHA-256 367c848e67b626c3…

MALICIOUS

PDF

76.7 KB Created: 2021-07-30 00:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b770bea978a6b14821642455c5788447 SHA-1: ef041abbaca781287833ac64bc7b3f0b6ec6b736 SHA-256: 367c848e67b626c3a7eac7675ce508048c6e2e749fb934ba3a577871e88ea627
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=tabla+de+conversiones+para+brocas+y+machuelos PDF link annotation
    • http://pierrevillers.fr/mairie_files/file/21845617397.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/3661879338.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210702_024F23E6BBC71251.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/nonuxidumazepamew.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160734655581eb---nipesaferesusobepamaradid.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/76371874152.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/35281097590.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2vibhc4v74tno89rfmnevfbhh0/23215523180.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/66513218134.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b7f600a7b30875dc4e69be521fd81330/65375430572.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c124ab1b9682ede4dcb44fefae1967ff/88643776070.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf89edc0---32142083885.pdfIn PDF document text
    • https://blokhol.com/upload/files/jatowi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/998daa5b94461f02ff83d517286eb621/fuxitaxazimixomof.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d6ijsqqperchcpevf1k1b2cqqa/verukotat.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/8140839270.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c869c8da492---birafurelukinelulugegovem.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/37690403032.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607620f26a536---92796543671.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lirini.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/27069464068.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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 11064 bytes
SHA-256: ec4d9a016db94f35a7a8ab4a040d2f1c186c549c51211361865c05bbd63a6510
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16732 bytes
SHA-256: 00244458da96fa8d1e38851008b82cd336a181f185095dcc58bda8c9fa95912c

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