Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ac92c2c89231b0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7aebbbd0ec115cca4921ffa91eb2f41 SHA-1: dea07c89bf62aad3f0d115d62eeb6c7efcb63bf7 SHA-256: 04ac92c2c89231b09444117e0fa746520a6feb2d5b43bdc8aa06a9964796687d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://centroolosprato.it/userfiles/files/23510269970.pdf In PDF document text
    • https://academiesutherland.com/userfiles/file/44405685460.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210913_224953.pdfIn PDF document text
    • http://dnepropress.net/files/file/12076612890.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ce5b266p0cbb9dhfqiv3p3ue53/luxejufaxuvuditadinaz.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143160d9823a---55699564416.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b0db83a3---17652988599.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12ffaa8f4---wikizekegesuponajilogi.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/96677583654.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/70386536562.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wuxapejubanasesox.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/gilepuzudezuwimikudeku.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109081658024812.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nuditepif.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/28715169789.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gulanapufinorezaxal.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/dufovebovuzowosifoz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706260241.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/41613066224.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/35054914666.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/97967499106.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/22233354483.pdfIn PDF document text
    • http://odumakus.com/uploads/files/xugezasojukebax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=osi+cyber+securityPDF link annotation
    • 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_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 17036 bytes
SHA-256: 7fce6e78832f337b0e10635404c8f2fbd111d0cb2a018e22b3713eec23314931
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10172 bytes
SHA-256: 0e52a8b01dcf4779970af392b79ec157639fce9c94f496856c7f1c4d8e18b63d
font_02_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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