Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b9f1fdd789f676…

MALICIOUS

PDF

100.6 KB Created: 2021-09-13 17:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da3f7feec1ef1d47f7779d4859e4e86d SHA-1: 976173285d1001a4f781319f0e8a0392fcc928ce SHA-256: b7b9f1fdd789f676d828d984c97eb5c1f73bbc4dc7a9d98c0f7d8ad447daa090
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/zalezenavuwuvegomarig.pdf In PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wopogorolatu.pdfIn PDF document text
    • http://saydersan.com/firma/files/72886911455.pdfIn PDF document text
    • https://keongracun.org/contents/files/wevejimulevidogozinavolu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137df0d98f04---10705659524.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109120555569757.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/63077083361.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/tanavusuwezixuremifow.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/62507022755.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/gozofose.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/vubozidisolewigowoda.pdfIn PDF document text
    • https://partnermind.cz/images/files/lezovifukozotexanupetev.pdfIn PDF document text
    • https://iwistw.com/upload/files/30180778319.pdfIn PDF document text
    • http://groupkaishan.com/d/files/bunaduf.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367dd45d019---96605237605.pdfIn PDF document text
    • https://network-italia.com/file/64565860639.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab4b4e722---54957637926.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/sexidusalogag.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/vegafazi.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210913073532.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/88821446525.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zovenigalisivadudapor.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/49848442478.pdfIn PDF document text
    • http://hmed.vn/upload/files/voxadudavakovesabemovara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+free+unfollow+app+for+instagramPDF 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_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 10940 bytes
SHA-256: 3d98aab3a6ac73116193f82120343c786622bd8761b15e60164cb7a4603aee54
font_01_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15470 18396 bytes
SHA-256: f9192b3398eabc830309872c5aa0d8bd0dc65dec2dc40734f9f093c2e363590d