Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05e6ef11fe51fe0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 03:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec177b0bafd3811eb94bfd5221208aea SHA-1: d6a03b725535846872fb102e7c0bc07923d3ba95 SHA-256: f05e6ef11fe51fe00885f46ed4d00ee8f5c744a1c4d41595c10a707a8c8f597f
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=fortbang+free+skins PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909144941143797.pdfIn PDF document text
    • http://dolonchem.com/upload/files/86082515845.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/89964713199.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/lufudevepoz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2b188540---18968136396.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/43166748087.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3ba8ac75---xawejawum.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/junuramefawidatulel.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/notuzuwiretusosogawid.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sj1ki6ulgat4j91h6549u3j4f3/78222063508.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/25396858106.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112be92a2d---fikadotenarenogizumi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/boritulakuviso.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/fapixe.pdfIn PDF document text
    • http://iltorg.ru/upload/file/2073824925.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zisuzizoze.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/76631474190.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/62562884604.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/wiwes.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/42519705691.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161437ade9eaf7---54846890278.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/44531559189.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/zitakobatakofejid.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/mopulesaxogofuboves.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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10552 bytes
SHA-256: 7b5b5d916595b8617b0062211a55658be0c7b0d7e9e2ef5e9bf51d2ff093cb0f
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 17036 bytes
SHA-256: 77ea327eeb35c1f094deb4f1bb1dc3967bc34f5bbba2e77963f416a69c8dd781

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