Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af9f4af08d95302…

MALICIOUS

PDF

73.7 KB Created: 2021-07-06 10:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6680cc11a3a988b049e676e537f59d38 SHA-1: c13931b42ed4e659312c36f5de9d44f64b633ca2 SHA-256: 1af9f4af08d953027307a226618e652bd667fe0ddcd9cfe10d0a4de862bd2084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=10+major+doctrines+of+the+bible PDF link annotation
    • http://www.serenissimaservizi.com//files/tuzovibukozuderu.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/sujofotofovetufosokig.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12655464c---51956436549.pdfIn PDF document text
    • http://riceart.ir/basefile/files/13879785951.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/37029074726.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e82c2294---seruwamojuriwese.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4364b777189b77de436c745fc8d5c9d0/powudizifomufijawan.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbfb10e7b---gibokunigatox.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1a870abd8---14817478065.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/jejukepunu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ed29c12e3db165794843eb7d0fb908dc/tomuzu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/06051441a47df511f4d598e9a1a113d7/74732990852.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2lhspnslbc7ed4t4uo1e1ajnp6/powumaxubapuzowavonukuf.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/namhi80d4k1pcghjrce4lvv0l5/vuzax.pdfIn PDF document text
    • https://mytopics.it/uploads/file/damajitagoviki.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098e04ec9cdc---22024348359.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01e42f50d---79542351105.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/73985837343.pdfIn PDF document text
    • https://laser123.com/geektic/files/17602707004.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd279eb487---firevipakujen.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/aa317339bf7fe60e2a029d57706c2325/fimurulaxipuguk.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060117451673499.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ebfo2j5h61hjcfrdlkkj65er5/14167740288.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xivavutag.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_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 16784 bytes
SHA-256: f0ec09a235529ae173fbc787e7251a9912a64658be7471132969a943b929edde
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 11088 bytes
SHA-256: 3a861bbe2490f71259f45c27683c6741c6e1c97ddc1f3cc2e6171fe0706cdb34
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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