Malicious PDF — malware analysis report

Static analysis result for SHA-256 0548491c81abd6e4…

MALICIOUS

PDF

108.6 KB Created: 2021-09-04 00:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d2a7cb409bb0337a5855a4daecf0b1 SHA-1: 479e5c22e719f69b6e46de7c3f742a73b8ab3bb3 SHA-256: 0548491c81abd6e486226657560d3296ee8a810655bec8505175a32c24db144a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=patrick+jordan+designing+pleasurable+products+pdf PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/4m422p1aj4s0ncbc8pqi88a9l5/12423684837.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/14540133673.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/pegaxekulosovagazijef.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610db2cf5db7c---kigur.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/fotasizitegazimujofiwesoz.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/danavijovojerewus.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/boguxeva.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/kelelag.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/jenavagerako.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/siligesavunezuwawadufutu.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/semedajuxojag.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gezatidowumuzabod.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e313b786---xuzokesaxuzujizufasoman.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076762e69577---dejopowujik.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/91450583776.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e284b63aa4---22530118324.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2n2q872l4153925p869e576kl4/38594917262.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6efa230aa355320b2185306a0a35e4d/derinim.pdfIn PDF document text
    • http://spbi.cz/res/file/42652398124.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b267cd67---53763393312.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/53277571496.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5ku798tf3a5s75lk9jt5s6fha7/59093209496.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/foluzojijisejifomu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p7i6gb62tf8pm94eg62famhmas/bomaxowop.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a007c7a5479---15867783014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA4 19148 bytes
SHA-256: 7d6e403e521783c946988c9e1b16ac314e0df4e3e5be7a64e7cb8bb8fd68cbc8
font_01_sfnt_off000171cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CB 11256 bytes
SHA-256: 467b18e53bca82c54b79647f92efe77a27ec315e8cd45db0e2e3c7662f851ee5
font_02_sfnt_off00018be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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