Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d2ff1d6552305d…

MALICIOUS

PDF

87.2 KB Created: 2021-08-04 08:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83b9bb9083edd6911a12dfc340c3dc47 SHA-1: 8d01486d30c19e97aa79aff403f720597a8a5794 SHA-256: 99d2ff1d6552305d48280fddda4063ab49daaba5b5b5a3bd0e43110ae9927288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=how+to+connect+directv+connected+home+adapter PDF link annotation
    • http://skupka54.ru/upload/m/36116722317.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c4rp0sj1g6k5d92ncodmsp6dq9/76239954563.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdacb2bfd4---paneju.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/89908581862.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b47948c8---90230637393.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107948163078---13823588218.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/489f0960350232c162504232deabdab7/48501508671.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/18f379ac188750b34275663da37d2d16/96632529546.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/kujaxad.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rifupal.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l9qr9ldr3jmkre8l25ljog040f/51637607276.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/44564715522.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/31502829847.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/mivitixiruvobedoxezi.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/8721453220.pdfIn PDF document text
    • https://irantruck.ir/data/file/94680455890.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47518af53---bexunovavobuborixatif.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/75342373077.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/95869967225.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fed532f6---fafaluf.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zamilifuvelopubusaworagis.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a54n9u10kjeti5vu363lviude6/26613978478.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4e1aa5e3---6891356661.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/45733846179.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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10708 bytes
SHA-256: 548fbcaab2123b786739546bc0447c3334dd630be4d2b349ffd06d06ccfc9332
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 17744 bytes
SHA-256: 4c4521f7d64ba6b2b4fc939b3ea8f99120c8cc29d23e4f4386944da316503ded

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