Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06278f680ec92ad…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 18:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f1f7e27079133c7baeb4bf7747af0c8e SHA-1: 59bd4880c58b325a66a85d828f1fc5d8bbbeac73 SHA-256: d06278f680ec92ad72f1cbdcf51527107f1937eb6e099bef5ed1b0097a0b11ae
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised or disposable domains, suggesting an attempt to lure users to malicious content. The document's structure and embedded links align with phishing or malware distribution tactics.

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://hsse.cl/files/61079838233.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a16547c1---momezawoxavopolod.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/foporuvo.pdfIn PDF document text
    • https://izr.fr/files/80152049677.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/77338662425.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/67526229124.pdfIn PDF document text
    • http://sjanzee.nl/file/mazelufifupodatuketij.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68101684126.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9c8f3cc7a25c5bcc11db5483e874ce33/wisimivube.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/75310418920.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/kekedexata.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/20176076936.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/78348788471.pdfIn PDF document text
    • https://derfo.info/resimler/files/81688434818.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sinox.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/85667079962.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/papakoraf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a366362b4d---77812927393.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee685a899---wojoratovixuvitotugi.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/75157403170.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/41247810398.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/remulosa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0d20cdccb71e3ef97c0d61428c12f60e/11182084192.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/94675368286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=auto+clicker+2020+mod+apkPDF 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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 15864 bytes
SHA-256: 54cb850de0ae0f9f7b95aa1e8a051544de5807fec78c38c32afd869c72402885
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 10820 bytes
SHA-256: 3b4b63c932296a05e4e819bc081ae84b21b61c13e77e9ab264b64303399812ee
font_02_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1