Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5643c1c02bbfb4a…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 20:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 990227389e93ff07b2e893d7f7ffc090 SHA-1: 6589e50b124c104833c3360844a4c4fb99898a5b SHA-256: e5643c1c02bbfb4a250cd709ceebce7bd9f0b091489d0d36e0d0aca03e289e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hvavcbkd6gfkvvsij1am8dbctb/48159786971.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071508c8d8dc---17865583698.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/34343596209.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/eb1813e9e35bc9e5e9a5358856947043/47781781010.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xidepalakajam.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8df2d50afb385028c8d34809a7e2d325/zatexepunuvesinejobaju.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e8cd891d---vojokuwivofaberagawedagax.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b842040cf09---jubukoson.pdfIn PDF document text
    • http://weingut-suppan.at/files/43752280418.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bef03999a110f39893a9faafee6b8fa6/fozelabetaj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac31fd4c5c---kagovovogaliv.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/bobafipexofitivezew.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85975389890.pdfIn PDF document text
    • http://jarosi.hu/files/file/8314479262.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/06d9aa451166e6eeb7eb789a53dfa704/vijulojanekem.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020627379720.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b9897cc6d8c---91324644758.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b55a2562d986a2a3dff2c973d0ce0fc4/58890676602.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608552e9c870f---41788287425.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/bafusadulax.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5034fba331---bebajodadavakojikogaf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090822796ad3.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add236e8b2d---63150638255.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/0a90a1060ee8eaf1c288d94a776240af/81950390029.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/27b59c94a59f3a1ba123baae95dc9b50/gerovetisakilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+hitchhiker%27s+guide+to+the+galaxy+game+downloadPDF 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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 11308 bytes
SHA-256: 443442e7726a396abdbb0186d5b31af2b8c710b25cbc635e1abff95920af76ef
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 17384 bytes
SHA-256: 40badf1b290cbf856853f394c00d3a0af654cdd39e7a08023b7f861aa89f0f39
font_03_sfnt_off00014115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 16488 bytes
SHA-256: 8af9a8ceee0f4c2c0268b0259014c23f711f0ae092c61a2df41393bedd61e561

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