Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c87336c97d11d4…

MALICIOUS

PDF

81.2 KB Created: 2021-07-20 18:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd6b8688a82d2ef8b086668167a09e29 SHA-1: 80b66ec43cdff2f16fa484d74d06d482e8b28968 SHA-256: 44c87336c97d11d4f8e410246de2f089253af2f2578bf9cf7d5b0c3fa1684a7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other potentially malicious domains. Heuristics indicate this is a link farm designed to direct users to external content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799dda72930---66555089211.pdf In PDF document text
    • https://t2sc.me/userfiles/70453513395.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/85884451984.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55aa90f68---50998089823.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/34188949520.pdfIn PDF document text
    • http://ippon.lv/uploads/File/satafadagesexokofiluvu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/90192449068.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c6009577d50---lejupekid.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/6507568503.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077098d4c65b---24783807178.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/napexemaduwikomuf.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/45531490487.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vawetezudenep.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7346e73944b9c9b74baa5dd4bb3103e1/roresumes.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9928d59bb---jujibozeweditepo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bh7htdufbq11u047ncrr8hrd61/23138675239.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb82d0036ab---82993355630.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3631649bb1e4335d6608656eff75ef61/85800024852.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa328817d6---xidobawuvanabudubomo.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/82751931342.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/binedodadon.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b91de04b---73376974976.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e1fa40d7---29175905497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=easy+dictation+for+class+1PDF 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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10488 bytes
SHA-256: 0b1d523f9ac7e6de175909a7d0598275c6d43f7bcf88e0f7c26cb630ee9be092
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16908 bytes
SHA-256: 9cbc53d1a56e595ce7b73a7d5e1622e58cd72348917a3f69f4c2f11a5ffeafb8
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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