Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8723982d52fd884…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 17:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb03631191edb414c386841c3e7b59ae SHA-1: 6b7c8d610834dec7b133d3988cd70ddb971ac2b5 SHA-256: d8723982d52fd884caa57e82c4e59922fe29f7e0b14ad945c76d7294d9139841
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external, potentially malicious, websites.

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 https://arabadvertise.com/userfiles/files/63304327368.pdf In PDF document text
    • http://thuocamakong.net/userfiles/image/file/tozematufomosuguvitif.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac287e012d987732279979b2d93b6482/vedugafa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347ee4dddba---67952736053.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/69223714777.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/52518429514.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sowapodubugilexutafew.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/tabutajerexonazad.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/lewela.pdfIn PDF document text
    • https://kar360.com/resimler/files/32651969364.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/rasexosik.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143678f80488---57834102801.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/77680644903.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/61951955129.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zodaf.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/11122752332.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/porozatuzosibaxesubo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/sugojagafugu.pdfIn PDF document text
    • https://12shio2.com/contents/files/fisapotegog.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906005034_m61g1x.pdfIn PDF document text
    • http://kasargod.net/uploads/file/91791345175.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/wofizinijuja.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/51274195155.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///vijidofaxoxunijalezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kaios+game+online+play+pubgPDF 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_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 10744 bytes
SHA-256: 0d9f25cf5941dc1a480a6babb6258067bc0cb683b5cd58975d49191c9af9c450
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 17960 bytes
SHA-256: 18967b9089f5c41ba28d9fe040015e9b05ac38eb8f5a35af5f8d6ce5c0cba8c2
font_02_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1