Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bcdf44f9ea68e7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 06:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d80e8afab833f9ac9cffe5e44004b9 SHA-1: 6001040dc3de73a303417fcdb28bedd35790e9f4 SHA-256: f3bcdf44f9ea68e78d4f32df5ebf2333f6cfd76caaddf375406d7c5c2056292a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. It contains numerous URLs pointing to other PDF files hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4212

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://krisoc.ru/uplcv?utm_term=funky+friday+roblox+cheats PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e1b0efcf1fd94fd047ce60b1f294765f/kekekufeleb.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lugaw.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/luvigitekakajofodutet.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/25924760596.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/69763119622.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/63881514363.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/pubogom.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16009919530.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/91499632367.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e87733a16---6822846252.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/57712952192.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109171903036349.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/sexig.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210907032001.pdfIn PDF document text
    • https://31app.com/userfiles/file/pezugevumuzujipotesej.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/gokebuxaka.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/43827381307.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fuvodivixabewinivi.pdfIn PDF document text
    • http://neteyes.eu/editor_up/74809455022.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/bekavov.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tezugojezimapemezoxo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7026def5a1c6bbe69714cb1515a4140/80734007822.pdfIn 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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 17984 bytes
SHA-256: b71812eeb848c05076dc72427c4ef446ed16e490834b19bb00eef62b6dcd7a7d
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 11096 bytes
SHA-256: fc1367ef1c3606262d2ee93a9e4d0f4cde645a9696080c6e6e61c7fcb95b3a55

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