Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d19ffeb81c9551e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-20 11:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a5629e412e6c4827383766651eb9ac0 SHA-1: 58fabec0a0b034720eb70e4941866422a213cbda SHA-256: 2d19ffeb81c9551ec3c4b27908d7bedf95de0c04c31dda103f7708665e0b3b83
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a phishing or credential harvesting campaign. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to solicit sensitive recovery secrets or private keys from the user. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/16784965162.pdf In PDF document text
    • http://goang-hann.com/uploads/files/202109101712432742.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/59331706939.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/gepagonowesunef.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wokezajupes.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/luxepe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4a0521a14bbdefdf605fdff2a35f3d8b/48100552105.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/96263112650.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/19301711637.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/10561756343.pdfIn PDF document text
    • http://merwepizza.com/upload/file/21386041181.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/68297d9fabf71d277b230df6621a0331/kugud.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/94243825176.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf9a7104c---1010316555.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iuh0tkhu9sblugho7llo5fin0/99891483412.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/jigupojukenosus.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/41284472012.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f50d0649d5ccc196d21a4c6e45913aab/javafitivusiruvopo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/pefove.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/96626611530.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/48734596964.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e851f39bb---58163984240.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/gekuwe.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/puvezikanogan.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/90279202382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=composite+numbers+from+1+to+10000PDF 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_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10756 bytes
SHA-256: 7cc074f037d542682c59917a4937678873ea4fadf23d2863e36a98625461e196
font_01_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 18388 bytes
SHA-256: d27778c3084d56058d7435c11731355c617077e29eb5fe4f4891d75876fffdc0

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