Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dd831abe22f93c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-27 23:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2202e9570302a4ffc02ff16a616dc7dd SHA-1: 68529d811b586d6a26b2278999c78d4980b5cca2 SHA-256: 56dd831abe22f93c33f34784fdecd05df9fabc6273cf5889814797a30060a90d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery information. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • 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.
  • 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://linza-market.ru/upload/files/83209714500.pdf In PDF document text
    • http://rideco.hu/upload/file/33436710845.pdfIn PDF document text
    • http://islandpointfl.com/userimages/wojolofomidorupeten.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66a826cd5---6404403927.pdfIn PDF document text
    • https://bselink.com/userfiles/file/memup.pdfIn PDF document text
    • http://darec.sk/files/files/41831058736.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f9fa48cd---regasize.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/849e5d547ffa4a3b089e02bb1ace9078/pimezalonarelavajawezup.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b35a631ccb8a6a69b06922d70d5727a0/xogumugozozubosuzox.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c517f703ef9---xapuramajijixage.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609746296beaa---pilazubavisesogog.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/87232844713.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160763398300b0---88576001427.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/pukirazomorimijikebak.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d425d10b---newegodapesevozivan.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa9c6b3e7---wudun.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc1e54eb8---kodosovinovax.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160843a9fbf68e---darubegowo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/rexoneladatekegazixexisux.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/h7jidnpm4hqipcaieca89vtq7r/78908334598.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609868f7d1c1a---sekure.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/73176755424.pdfIn PDF document text
    • https://chptravel.ir/data/file/tixujusiwexozuxid.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e7f2906---gazowaralegara.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xamujaxubowames.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/79304853886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cahier+de+charge+fonctionnel+exemplePDF 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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 11032 bytes
SHA-256: 92000c5d42fa6c4294f7c06f1fe45dd6be7d2ef4c1833f024ed2327c54251e55
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 17632 bytes
SHA-256: 55d08d9ae16688624e4bddde3f155f60852facf2affa1fc0b2a7d42fd4124ecb

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