Malicious PDF — malware analysis report

Static analysis result for SHA-256 83397d1e9b340ce3…

MALICIOUS

PDF

96.0 KB Created: 2021-08-05 22:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e436c83d630297271d736be8e74d051b SHA-1: 0156f6c1b0b3726fcb2ff7611cff994d66167236 SHA-256: 83397d1e9b340ce3d472227e48dc2a021de828fe7fc18f91651fb79c7491e29c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://agrimal.pl/userfiles/file/vukup.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h6jfrmk6sjtco5f7rr7le2vevp/vezagogo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gs7f87oi480lis1j7aep1o69u6/4298391944.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb713b05f8---burul.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56477733798.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97b72bcd2---99838961748.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/nokesiminerikugukedaxato.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nunote.pdfIn PDF document text
    • http://leise.ru/admin/ckfinder/userfiles/files/kesokuzuzaxezekufepixe.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jomadoxonatopotutofumulug.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f323d5adc---83049790375.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/dewaxin.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87377065499.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/88146069083.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4833130c---78677832195.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/coqqij72cq3ghmgb7jbda3tuqk/komubumudizuwojonu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855474d39e4---datexuvexunezerar.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/26585961131.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/85987685817.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf021529386---xipurafopuzisejefilug.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/156fc2187bca1fbabe4ff43650ed24a9/40087671278.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/69493477106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=girl+x+battle+fran%C3%A7ais+mod+apk+unlimited+gemsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f09b9ee37a0c4d9a2e3ca405716b16fe/6971377066.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 18272 bytes
SHA-256: 81e664be667158710f76e5c74c7ebd0f78bf58a2d420f4f36401e6015e003af2
font_01_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16308 bytes
SHA-256: de7437869808f3c9fb58e58f778012bdc98e49e1c703d0f51202b2214dc3f8a7
font_02_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 11512 bytes
SHA-256: 7d5b4dfc1fc79de3799a9dc5d62d3a77a5947e10cc0a4805ef7003c419bf0c89
font_03_sfnt_off00014eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 1784 bytes
SHA-256: 82573c13e19cdd3f9988b3f195eb5c9b037983725a5576cd9fc1ee1b703170ab
font_04_sfnt_off00015716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1