Malicious PDF — malware analysis report

Static analysis result for SHA-256 9083dd83d707c128…

MALICIOUS

PDF

103.0 KB Created: 2021-07-19 00:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f8b39c0190e66e19f53b65c4b5e35f43 SHA-1: 615002c978f27cc96d14e17f431881e044d1405b SHA-256: 9083dd83d707c128c58f2d53f18fe485d06f046579bb4595134e9e8e3d3446a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zwickerfoto.hu/_user/file/pumetamimudap.pdf In PDF document text
    • http://consol.hu/images/uploadedimages/file/20289351460.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f4dc6aea---56415221349.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f82d0c1b---45908793743.pdfIn PDF document text
    • https://tonitomov.com/picture/file/10309853352.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/23549969168.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af79ade3492---65286338299.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a99a52ff---58331715577.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/57493472000.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fc6aa3d01ebaf9fd5c3e251dd586121b/xewifidu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gusog.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210618223053.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/ritodaxelirilurazi.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/vobuguwenidamasonazibi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9107e98013163576b2834055d93f61ad/6350896477.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ae32bf75---dikarowuwedepeboxata.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/71444586965.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e867adb80c965e68e64845d546a75abe/zurov.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ffd0fe330c29e05ab6e6f48c6ba97d97/subur.pdfIn PDF document text
    • http://technocom.pl/editor/file/mibawisufuriziwenujej.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef9ba350b---99291498223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=loss+leader+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 25100 bytes
SHA-256: 3714f3d62aeeb89bb675f00c31ce94d2506a2d3d86d4b755a9e31b10061e5595
font_02_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 17164 bytes
SHA-256: 349843619bb58167c9b2c9cef32b0e91dcf15167fb66aded3da3443cdebd7fb8
font_03_sfnt_off000169d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D8 3184 bytes
SHA-256: b33758be67b7e34f936d18d0201f49a7e1bb858e8a13ac7f432cc50d798c1caa
font_04_sfnt_off00017667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17667 10452 bytes
SHA-256: 2f80d921047c2ca358141cc26eb7576a02c5fd3db91521b3f6dcfa5686955b2e

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