Malicious PDF — malware analysis report

Static analysis result for SHA-256 2781a6a1b6884574…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 11:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2eae82d65a8f00a174100ff3ca68f02c SHA-1: 2d571bf2fd14d73409a59fa26c01ebd3a83a3d74 SHA-256: 2781a6a1b6884574502d3209c616838d00460ca7207878775f63c41782293d3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://benetalent.com/upload/files/53068047110.pdf In PDF document text
    • http://ancient-theater.gr/media/file/wowakupokuzipoxigofezezis.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/59395874773.pdfIn PDF document text
    • http://palami.by/images/file/82730232107.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/75763301662.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/gogewawaviluwedopi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6dfc458d59e52d9bb1e94f726f92e9d9/pavusujemobi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fiseseguvanupisavevimusiz.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/buregesiral.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/tumugafomike.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/silinal.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f76a1322---46813124645.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca69b4be537c544bb35ad9534cfcf710/rofedojamusaw.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/95010957517.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lidilaxisobovewevudizatam.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/vuwefem.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/94994013365.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xatenadeluzojijofozezata.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/gumegonozobotawizu.pdfIn PDF document text
    • https://virker-ikke.dk/files/46399488278.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135446fa9905---18749679559.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/xetil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=emoji+translator+ios+to+androidPDF 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_off0000ba77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA77 17992 bytes
SHA-256: c21c09b275ffd3ad134e9e8808a079ca00346ea6f01e83759ed72c46b8200ef5
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10392 bytes
SHA-256: 8a0688512c45bfd8baa691f6754b0a83eaef9343f4fb1dfc2c5fb91d332b3726
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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