Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e23677568a1e6c…

MALICIOUS

PDF

91.6 KB Created: 2021-07-13 15:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b426de088c1659eb95272c4d3a28e74 SHA-1: 46daf4d25150ce479dfa35e280801d4e7b4355b8 SHA-256: 90e23677568a1e6c4c4023d0da908ae35af745335d4a8428551c985a839d18b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself is also flagged for containing duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=demon+slayer+movie+top+grossing PDF link annotation
    • https://festival.bg/fckeditorfiles/file/85884283309.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4914609a7---dezamum.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/ca683a4559633eeefebf2f43c1e8b84b/jaxogivevomerol.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/69078185826.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95616238120.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/93972675056.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/repadete.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca7f99772---32510291329.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sm3mpcp9e96i1ge0ci6ot652ge/nuwitejunaxopu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/878b3e8ff5946979c9e14deff80965e5/82239000767.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0218412d---lamimezewivovun.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76b22e8af---88062047858.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c7ff017a---28752399923.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/524fe38f94b3c7f432830264a7104dbf/kidilonenazudum.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da39156cf4---76777245073.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/diwuwu.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/lafiroxedaganiwefome.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/fexabibasotalo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2faa23823---kijuzemimata.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b20262cb8ee4ec9ad98d9ecb7b0db3e9/58088971905.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4b0b0c429f5c2c2da2e6b39150227127/77177756164.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/76822159221.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_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 10776 bytes
SHA-256: 19bd748829b86e211644b18d2ce959164b1ff020d6ebbde4a153977e8d2f9997
font_01_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 18452 bytes
SHA-256: 5640a5fdba811d3bef092cc0f2bb127284b29313f4aa615f41d0db9261a89a46

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