Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da9069741c3b24…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 19:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0386e28caffd05be4b26996c698d1391 SHA-1: d6a81d189fdf14622b20a8ad2d7e7eee278951b6 SHA-256: 41da9069741c3b242dc30844efedb2d32ea1c582e5b7c19bc88180d156e69b0b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting it's designed to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in phishing and tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ebal.ro/app/webroot/files/userfiles/files/98431798830.pdf In PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/6162169186.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wumeviliv.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5d382ce1ccb10d68f42a2138264136fa/86438586970.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/80622852085.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/midomululudezeduzesi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080999e98e41---1785217422.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5eff876d0a87d6044ae61244b8685591/kigotasagegu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/43475b32906e4292c455caa197754ee0/girojiretosutube.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/552a33b45de0df066461b42accbbbd61/pujusigatexivosasovagipe.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/tokulonivujojilisajerib.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/50329640129.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5f290o0io7ga7lb7o140sieuum/75474293746.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/47920006970.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/14b083699e5512f19854616986fcf580/famujotozujowixoxe.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/86856483022.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ig9orvkrqaq42ep0l0a8dlaepo/62232691813.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/i0qp6eblrseotmc3b7hra3kt8e/sorupinogimazivepatapame.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/df7c029e050ec2d8f32c48ca13f89018/82712689669.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/kipozo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8084gg4huldekii78cahfrso0v/sinopugi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0490e6bc---kasodojuzanavezodeme.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tewatobod.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/48505583109.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a5pjagfg2r8jvlup7iasd4sba7/11678427383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+vs+iphone+numbersPDF 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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 16952 bytes
SHA-256: 6330fb77fc1cf47319d9bcb64efdd9598d99e1625643108eff44a64ad454d643
font_01_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 10640 bytes
SHA-256: 1a2df138cccb16f27d45f94f21f97e3f7d2f9703557a0fddd05e139a4c54976d
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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