Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a20cd66a751e95…

MALICIOUS

PDF

120.0 KB Created: 2021-06-29 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 389caac9830566e9cb6d8b02222aa56c SHA-1: 1d95656b4de29cfb5c688e68c36d93eddf2131c0 SHA-256: 11a20cd66a751e9501f8e82746db0408c5a3ba6d02829a763906dae8b5dc885a
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9854

Heuristics 6

  • 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.
  • 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 http://residencecarlofelice.com/userfiles/files/56948052512.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770c871c36c---wejilowapubitiligitid.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fe2fe6ac769546972de419546b3689e7/12208039633.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a043a647278---jexelototewopis.pdfIn PDF document text
    • http://yjccnc.com/upload/files/wegepesareg.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gusilokom.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3a19cbb4---xijikaxometabufedo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/posebuvoti.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fisunufox.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/pevojamulevox.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c025452f4d1430d61d2eefd2ac5397e5/pojigigabutubumivesunasa.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d6134dda---tobovosotadik.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m32e0rtaa58jbl3c3ut07nrmf6/lipuwotivowenafasupiraliz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b2459530786eb67e2654160b6cdd274e/sixorirurisitekinab.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1277965e34fff7986a71b0f505d5891/tanejaposevaravakusojuli.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607517801b36d---66949215065.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774f4216063---zipijigovigunibape.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/lumibet.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e0358cd2---57820415690.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/66840793715.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d28d3839---denubudavotedimojizukigo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/hr166gs3ou706e87l5j1512kfj/gusifogax.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5rj0gqsa7l3i2p9qg34bl6724f/88791070100.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2mlh96aa0oae8rfvk332huc615/nivakuvawulujisi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cea62c617---22093773986.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/171156485127.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5202a3b2a6---5044622142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+you+doing+wheel+of+fortunePDF 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_off000170dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DD 18004 bytes
SHA-256: d7467889b02779dcb3b27a06e3188c55475ebb25f8b733df7811b4e09efe3ffc
font_01_sfnt_off0001a03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03E 10760 bytes
SHA-256: 3dde215664b96a6e6d94c1013542e128e443b321b78fa8f4cb2ae109e1acf238
font_02_sfnt_off0001b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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