Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c2ebeed2b70273…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 01:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5321a062fbaf018fd7620653002b0e6a SHA-1: 3518403ab28a474cb4746d2b6b1977c5b9acf959 SHA-256: 15c2ebeed2b70273b19cf5083768a7dee76c5982ac7d7060642cb99ee40dc952
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests the file is designed to redirect users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=dual+sim+samsung+phones+in+sri+lanka PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137d85cbeaf5---niluwo.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/nobuwulewejiwi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c6408e82e0040f03209e5dc8d47b3555/41387651912.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/lagemenikivovuwugusozigi.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/64365671312.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/41638611609.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141e526294f3---99736099554.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/pakozeku.pdfIn PDF document text
    • http://bndweb.nl/upload/files/95154705373.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1440a633ccce306bc73b1e200e17c9c9/rofimijorarifawipedebu.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/gemazor.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/4385115063.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zetatirogoneninifibosumew.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17535843206130db73c4e2e.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/2111939380.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/luzosasivewefuko.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/buzajimafenonebuxuja.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/tedaf.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/47598164216.pdfIn PDF document text
    • http://e-sheremet.com/img/2010707477.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/vibipuperovenosaxuvo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/62089308123.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210903152053.pdfIn PDF document text
    • https://kvzriu.org/images/file/mewiji.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_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 16844 bytes
SHA-256: 6cfa75b0b4b97edb4b0a2b700b9e677166f4bd7b98866503d12ad5fecb66e8f4
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 10792 bytes
SHA-256: 3d13418fd29ca92fbeedb3744dabf79537fadbf80802a6c8a2a80a3f4beafba4
font_02_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1