Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fadf88aecce2b0…

MALICIOUS

PDF

89.2 KB Created: 2021-09-19 10:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9666a7fabf9716acd023babdc2ee54c0 SHA-1: 1f28ffb3d91892fbdb9750fe9ff8ef9518cdf5c0 SHA-256: 13fadf88aecce2b0a55dfd8e0da48317ba8449e7c1191f25aee352b8e4c880f9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing a fake browser update or extension. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=kindle+pro+apk PDF link annotation
    • http://skiflogistics.ru/userfiles/file/91799061548.pdfIn PDF document text
    • https://plasy.com/uploads/file/66843784600.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/11580647777.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/23747730796.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/wutave.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/pavokubiluwejuxex.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/8031487930.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/83555837196.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xubakigusiwesu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/846747325.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3772433427.pdfIn PDF document text
    • http://riph.pl/userfiles/file/7317288521.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hq5oo3nf8ucs0euthuaqrlje34/92191043371.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109022209493606.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452d55580d7---tadunopufuwimato.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/kafidexig.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/30323465058.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d31579d283d6ed59544587dd24210b64/jowajatafudoxubuwu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/poxewunilufamifofej.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/95523003758.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/78727790802.pdfIn PDF document text
    • http://newcityhk.com/userfiles/98467724651.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/vibafadowomajom.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vebotigukipofezopuja.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_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 18228 bytes
SHA-256: ff0e42a990acb903b49f7101bbf583b261c7882088f940cd007efd9dd94870c5
font_02_sfnt_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 10200 bytes
SHA-256: 52858073f25a8d6b872d6f195ec2eb52e5bbbdeabb75878b8b266a41d00f1be9

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