Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36a04c7444206ea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 02:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f2d7bb8064d8df923fd3f8c493c4447b SHA-1: 8ccfd2355575600741a115f0a0e4ccaca47bc8d1 SHA-256: f36a04c7444206ea7f1c0e4b873770199894c2d181ee0e992ea9a167ab28d866
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were explicitly extracted, the presence of numerous URLs hosted on compromised CMS upload directories suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, preventing further analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139d116b6ae5---43224335232.pdf In PDF document text
    • https://panelshock.com/userfiles/file/mirevi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h67lgvhj78vq80lsdu8rf526hc/93929293099.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6bbe0af---87954209221.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/24244565322.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/12169565412.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/41708457784.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lodorozuvaponesupu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0302b9830---58786017141.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_9B971BC8A07ADA3E.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ninuladizul.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21643336882.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/fovenigovixop.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/46019931333.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/29718889696.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/77694722132.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465ddf3b3b5---leredetexurifaraj.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/garinafaxofezuganubijata.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5a798cd1f2714d9389e6a0b433057b4c/gesewesaronikawuz.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/morujar.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tofadiwokobidogufovu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wimuzapulapimegaviseti.pdfIn PDF document text
    • http://szjg.hu/images/file/40207103190.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210914014531.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/22614078106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=clash+of+clans+crashing+androidPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 10556 bytes
SHA-256: 0c45e50acd9282c63c2ae11fe37c2d39781b78d73dde6e901b5c3bb2bdd50c7a
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 18836 bytes
SHA-256: 6737e0bce941aeda6330af0b781f87ccae5a1ee54918526def74cf9655739d22
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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