Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f30a9c432c137c4…

MALICIOUS

PDF

107.9 KB Created: 2021-07-01 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8ebb723c132d1b32f5bfbc48ae1bc4da SHA-1: 785691acae7843cf837799744791d5fb429cf36e SHA-256: 9f30a9c432c137c452fe89e07dbabf6fa98998e7d45f932898210626f339b9df
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://ultraljud.nu/bild/files/ruzuxalolalunukagisedujif.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dei5neoddrmkmhrik6gj5hj2uj/bizofetavijibugowa.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/zixireligaj.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vemezavutawoli.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/ladarir.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39f85b6bd---75031835985.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d5840474af7bd7a963b8c2b32d67b456/kaveviduganakajonikupaza.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cae270767---25801061796.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/45ab88c5d98369d13584f5d28b66cd31/kesagifupunerodiravini.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/sidedizopagenuton.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c729802a8b4---rivipalidubopelerilolage.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/jorafujudivazudubilux.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f5c1735d3642466e9538286c85da8d71/88421487242.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/boxim.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/nexuxerefuno.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e27336cbc---nuwotowoduvesuti.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/60839880212.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/baxafepajovaw.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6e136c61d302cbc91ef9f7f287857a57/14644800093.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/80d115913b82692cc4d1a481592b1fae/rumogonaposufafozizil.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/dpiovi7ddirqm42a26llbm65lq/99372794129.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2e6fa9efd---90094997270.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f0418bed---38616485352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=national+lottery+ghana+resultsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 19224 bytes
SHA-256: 07422203852025dea1a4fa7f261f6ed7aaa50a3f71e50b8c4dc38c1b978298f7
font_01_sfnt_off00015a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17254 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off000189f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F2 10580 bytes
SHA-256: 6635b63ed7162d06ed2094a5d883c3f1b01cd0abc37474b324e8e81708965132

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