Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f941b207d5156f1…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 02:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 968c770f774f0c2eccdc09cb5a84533a SHA-1: 1e5ad85d5c001dd4c99e7fdbe856626339fa51ea SHA-256: 3f941b207d5156f14091f3b83ba9b00dc7f887b2b513b801d74888309f948e56
196 Risk Score

Malware Insights

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

The PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common tactic for credential theft or malware delivery.

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://krisoc.ru/uplcv?utm_term=guts+and+glory+unblocked PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160def373ba1d6---dopataj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tvoigjcf1m1ncuk8gb7gomdu6d/xawetizajusas.pdfIn PDF document text
    • https://agermag.ro/mm/file/zurikuxonofud.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098da06a115a---lizuxizezopejizidixiboku.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u7dme2j2pkaau2eqjgtc7fjnhe/nizafiregiwar.pdfIn PDF document text
    • http://moristas.com/userfiles/files/bedadajajuxuz.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0f0e26ce47cd015860ad606f935bb76b/tetabibaxipikutapimijo.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/tepas.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/81811898785.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lisumetoli.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00bbd5de8a---77450075396.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086386ab6922---nixale.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30d57e92a---93359896122.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/jubegeripidapuzo.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d3daa7e0252d2cbc2f53d9424c137aa1/dawawutepe.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494205c126---86723008605.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/38265170825.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b517e065862---vaverupolulawuj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b47446ec3dc---82707991162.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a1c9250c---29456652828.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe311b863d---28741134980.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c9ffaf0f2669e66f620da900aacfd778/77340485301.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nomedomalokoxizapesilo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/o42dit8ne7lhos3bi0j9mcimi3/pates.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 17804 bytes
SHA-256: 2c77d80b771b4fd9dce1bc05042f3805f57a2617030a02c4533aa02c00a81865
font_01_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 10940 bytes
SHA-256: 52688c83d6a2eb81544bf9fe82116f27de7ed535568589f7fac6299c1ec67a10

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