Malicious PDF — malware analysis report

Static analysis result for SHA-256 695c6a58f152fd40…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 09:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e31077dfa4606de0d96e81a0d46960c7 SHA-1: eecfe3a166baa0a762627283dd7bb41a0e70bbdb SHA-256: 695c6a58f152fd40d8055dfc2d53bc76f9db1c699a100106199bda80e1766949
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a tactic to obscure the true destination and potentially evade detection. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d52079c1---25067906224.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iicr2nt6h6s6ljgov4smgjj2j7/megorasanaruda.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/623f7bcdced68efcf42c6a9c9a2b6a41/fimigetufobuvomema.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01ac5b9be---bunipa.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/dozenovofox.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090552214d50---45444976693.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079294ce82d0---61233821203.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/r9uoo06ljttcrp39rq6b0oae13/54817684475.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/084t13pke8d6va7k3ndh8anmo2/woragoxunopigepisodi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9157ad9659b5cdb73983614842dd05c9/98584463437.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/35754031248.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tozodutarew.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/nitogezaxudowojifa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c69ea1f49b---2515469216.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fb6d8bfe9627f190bfef150cdb76f8bc/24757862413.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/9926891455.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a83ac29e5---motuzopajagaliwufu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/woruzimepok.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pakopenilit.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/zudinonumozegaveraw.pdfIn PDF document text
    • https://robertbah.si/files/file/kopemuvizogunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=autocad+study+material+pdf+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 17228 bytes
SHA-256: 25245d3926248872016c54203a4bdb70531a5de2cf6802144207248dbda5cfcd
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 11064 bytes
SHA-256: 8874cdee169640ee53230248f1f5ca5b4c40ad424a855be56aa125b3332e3db8
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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