Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d40e38e2a027016…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 19:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32ac7e093af010aead6f589858d232bf SHA-1: c6cdcdd1031aa2eb5a73ca7e92fb3b4d0b153599 SHA-256: 3d40e38e2a027016d38502b7420408d403fdbff72e363b1225f0e6fd9eef2872
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to lure users to potentially malicious sites. The presence of these links suggests an attempt to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marchmontnews.com/imgs/file/74814633432.pdf In PDF document text
    • http://automotiveenergy.cz/userfiles/file/vemapekuseduworore.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/13add5191ea50002dcd86854ff13abb2/jegaroguligeke.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/98885446719.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a35998b3320---26220578693.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2807369106.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f4adee2a.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bv5hogkqvu08r9e1cs8n1o8sdv/faxogubifivujogeserupil.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161038bb14ccc5---vovinevadiwopizoj.pdfIn PDF document text
    • http://unseretochter.ch/images/file/91446629350.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/30800607773.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/33567491703.pdfIn PDF document text
    • http://mlight.cz/archiv/file/74472692541.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vilumuwadogazapele.pdfIn PDF document text
    • http://drhkltd.com/upload/63293222652.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jizesififib.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c411c686d---75216216583.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854b017e2---rigumom.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6f695edf0---97997891311.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9kfjc8sb7r3mhidk0u3qvd2uv5/72318410388.pdfIn PDF document text
    • http://planbmedia.hu/files/futirobutawawi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/26c2bf0539d01d87efa300dc0fee9e64/67212629573.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1520350b76412cf8e6b862fc94f2b289/nabanexobebewuja.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/punamelured.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=science+worksheets+for+kindergarten+pdfPDF 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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 19520 bytes
SHA-256: e34297946ccf638cbf38df86e59f61420c9a56ca9c0603acb7a0572a6250a1fd
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 11104 bytes
SHA-256: 7ecb37425b24fa2ef77bb1141b2952c96fef8acee617478629e33c4029dc3867

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