Malicious PDF — malware analysis report

Static analysis result for SHA-256 4476d2af70437f55…

MALICIOUS

PDF

95.5 KB Created: 2021-06-28 22:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41ae3396e7bf3cfdc5558ecc403925ff SHA-1: e561d6a46976d44dbde789da1188c88d307be08d SHA-256: 4476d2af70437f554b6b63dbb22e35c00e18aac7850c234d532219d232db4c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites for phishing or further malware delivery. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=imine+formation+mechanism PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aaf3e6182---2177955964.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3e9d7053---26001147412.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6b9b238b---zofitovunamukili.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507022137_1106789985.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/lejakipaxuf.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080919ee90a5---doponijodimubuk.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/83903947989.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/84536632541.pdfIn PDF document text
    • http://arablift.net/userfiles/file/lukenazidugevavaxupi.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/78960150243.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5aivlmpb693p6cielf6oljn08k/lovewopokiluwevotiwuliza.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/vaxajawamakogirugogupiko.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/rodul.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2lhspnslbc7ed4t4uo1e1ajnp6/powumaxubapuzowavonukuf.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/fikagal.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/revigotamorumep.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4982aafe2---13430392783.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d132a451c4---92379482885.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a025c5330---mijakudopibedaruwuzibewib.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ihgok31ch3ajpf2ug7a6upfm52/wugadagerizelotevu.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/36527681688.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_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 10504 bytes
SHA-256: ea555b1cc7c7bd92ec38855ca8ad27de160de27bbffc9aa3c71646cc46182b7d
font_01_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 19488 bytes
SHA-256: 9b7580339452586a1279b1e333c9c0d6878eff2d1417a0abda0ec71c30f9eccd
font_02_sfnt_off00015944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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