Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73b4cbafe802982…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 15:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42ccb673ff974681d7b871a09f455179 SHA-1: 4a48498f7f9dcc9952030798cd43e10b4bcb2508 SHA-256: a73b4cbafe802982754d0e9e10e5ffba62c5d7b948ce28201d696b79541b9ba9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=get+apps+hack+apk PDF link annotation
    • http://handinks.com/ckfinder/images_store/files/fakipogidena.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/87911380847.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vobujewatuwibavejixer.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/33055699439.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/nufodubazevakizavizomefud.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33879482359.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/wematewipanemufumawoz.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_D1E91A38DCB59DE6.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ae8d987690a4521c9099a1cdafef774b/39669216143.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/61235111404.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/85034725273.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a59342f---82103235531.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/9953339860.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/89423584062.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/sipamatibo.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/113940153761350de37270f.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/18239415135.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912191959557.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a694d9de---18145716992.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/47467705853.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/tibekanujokebewowuteket.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/bamukufa.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6bda072a607496b3174664d2abbb7531/6344692017.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/64785215115.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/27003453941.pdfIn PDF document text
    • 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 10140 bytes
SHA-256: c4130e3f201b9bf4562eb50817bb2bbf4a314846b8f7f433cbe3abb7ffc9cfdd
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 18860 bytes
SHA-256: b571624fd3ac8b50c456aea9c7de587716e52a3785aa6fdbb195d08a36db0dcb

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