Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0ce24c3890a199…

MALICIOUS

PDF

81.1 KB Created: 2021-07-03 15:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4343c1b6895f4e62461b3fa441746efa SHA-1: e39b24697e45de6637659748e79ef937ef03ce06 SHA-256: 3b0ce24c3890a1993f07668e7c02fd0a7655fd9b5bb0598b8bc80b5284122c3a
164 Risk Score

Malware Insights

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

The file is a PDF containing multiple external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=12th+business+maths+guide+free+download PDF link annotation
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/b977d2bbf4be4eeb992668a755b081de/vugukijurenopuxibofo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vemezisexosudavenuf.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f3f535246f---61384255599.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/854a0d96dbab56a19463a1c181b40593/12690311070.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/47700244560.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bdda5a82---43709100400.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ndd2fn9p1k0urrdptb8m2qvqt2/58665784500.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/vopafidogonewewakanenumaz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/43bb197425672b4b668ac2696a066a80/nubonutevexozezoxijiruzan.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2d7dc7b8---pidebuzatunajenuletiv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607486cf461b1---98004210138.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ecda4fbb---wiwutavibisarupat.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2s1gkhqt6c6slr70u630daqi3a/16667567234.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d2c613bbb9a2e4cbbadd96f5f454deb4/19654358901.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/01dce68349110d801d18be97bcc47b44/26678573453.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/mofalunupawuwedefolox.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/23379733421.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nalebipizevit.pdfIn PDF document text
    • https://rajaunited.com/contents//files/34564635880.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9d962ef1---50881570836.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1a94c9ced6829622d41c895285276442/68252126309.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wududazikagoburinos.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1fe383920dc01c854b86bb4c054e896b/zawatipafovatufave.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/9025839865.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 11200 bytes
SHA-256: fe545a990711905f3e2d52b623e96bba79cc404e09b1e0c0a18ada8e9d748541
font_02_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16768 bytes
SHA-256: 61df1c0e73187fbb7854d127018d192792334302a49ff442588c24bc88c3a4bc

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