Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d7d8203bfda22e…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 22:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bddbe68e58c1fb851f4043eb65ddfd9b SHA-1: 12405fc95aa142ce54c2eef14af8b2f7a5dddba4 SHA-256: d6d7d8203bfda22e3bc2e91f2db4c45cb6766e608548efc3b9160a3d640fb020
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, directing users to compromised CMS upload storage. The embedded URLs, such as http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aedea680---42665427419.pdf, are hosted on such compromised sites, suggesting an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafdc77601---42778689881.pdf In PDF document text
    • https://icon-studios.com/userfiles/file/putodukaxepila.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/wogixaganexebarojine.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/galavajivelisujesefosaz.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/45543859033.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121348243045.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161350a312d2e4---53739314520.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/28244382076.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/pakanozo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aedea680---42665427419.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/nobegozimup.pdfIn PDF document text
    • http://askaudit.ru/price/munonirilupuz.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/70153632451.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/87296822472.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gazaxigazepo.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/72836379467.pdfIn PDF document text
    • https://lorrainezammit.com/files/file/bizuxazufige.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/6762258411.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/puteludomalomidodidiripa.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090913314722345.pdfIn PDF document text
    • https://kermanrooz.com/img/files/17891437348.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/fojikelepo.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/24909812461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=will+you+pick+mePDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 17920 bytes
SHA-256: f8bd6758bc760bf3d4f65222a93b8dbd6b3dd16bbcade53db8d90f50a27facb7
font_01_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10200 bytes
SHA-256: 65de2eb92195b08a7b1e0ac0a012b05ea7dc10c9d79aadf715ba84de24017b0c