Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f3e3037610312f…

MALICIOUS

PDF

104.8 KB Created: 2021-06-26 09:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f93f0a0f84f0e2c38347a6917170316 SHA-1: c44da49e651ecaae60aeb62735b27075e5b792f5 SHA-256: 25f3e3037610312f02fe876d458eab29510a3feba72164ba4e27cbeeea2435dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to host phishing content or distribute further malware. The presence of external URIs and link farm heuristics indicates a deliberate attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://medvor.ru/uplcv?utm_term=boys+over+flowers+serial PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080682cb56d4---rufulok.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c1c7d8a---12272578158.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076cca709e3d---45658684938.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/8024504697.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1da50b916---8754988193.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609120962f714---buserevufoxuzu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d87e91fb3---wovefexitobufasiw.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zedenujojesokawovutabupe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c5a015e8---81990411104.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/40113926780.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/516f15786a3313663a20c6bebe886723/limajezafujemofupir.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d8cd3fe6---33051948836.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/93294006379.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca018ee6e---wimazopibijotimoseve.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa4eacc5c---48227536085.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/603025otljnpfhlnju8omuqc2d/66664311058.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wozemet.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/92b778d2b18736b0176f3e1fd7402800/pavatoxez.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeff39f121---2593632791.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/kuvomiwifozezafufotizuj.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xomofudodeworer.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/kozomanejemofudor.pdfIn PDF document text
    • http://carszana.com/image/upload/File/sebaz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b58c45a2---wewibotulolo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091908b725bb---nisixuxifutofolizis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 17332 bytes
SHA-256: 2d992ec4d5a3855ad3ed1b9056632df70e6bf5a6ce947f2e7cd90f21ab53a545
font_01_sfnt_off00015b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17366 10324 bytes
SHA-256: c7f22f4eeaba540b65bb48dd4b3def5c4bfd78198adb3895c93cbffb23020afe
font_03_sfnt_off00018ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE1 2404 bytes
SHA-256: b5f3c09d84e9d1028b84df3156bab2cfc850d8767784c17df1dddda38865e8fc

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