Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1037aa6f3f0b5d8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 22:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c36344a7963baa011c5bd39f1c983595 SHA-1: 4e0200677fe0a216652ed23645776f1f1c122f03 SHA-256: a1037aa6f3f0b5d8bfe8e2fc85040c2a5cc76112f04805b2cde3ee43abf75d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=esl+synonyms+worksheet+pdf PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e1b8a006ba28a776ddf560a67daf4cd6/sutabudezujatanavev.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/76764123314.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/34495328311.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c30780c7594bb71ecd760b4a0d784058/64137832274.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2fo0kvkcv56pojf8ntcj4iekue/46267983128.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5c7f5e1cd887e7d46fbf03b5fdd736c9/xijirotibamawokawokize.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pekejupesu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilefinoxijasivu.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/jozasuzukexozotudedo.pdfIn PDF document text
    • https://attack.lt/images/files/24968536802.pdfIn PDF document text
    • http://zuche0551.com/upload/file/93830639398.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/dogemimuripiki.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/xirenezolojew.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8769710205.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e029b0a77---kapedowunox.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210803021440_rj8ymm.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d632ff117f9---64470129623.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/83560655548.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/68861525020.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cb023cad25b29020c7f5f2ed0e87b27/23314475772.pdfIn PDF document text
    • https://suksesunited.com/contents//files/61007456144.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8d90b052---95933226539.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/32648574975.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7obbtg673enpt5f5ovce2pjm54/gusixoda.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86572618a7---pikiganis.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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 17808 bytes
SHA-256: a0d4cfd47611023af02e967e343346d76fe7f466e03d47a41a84cda23c77e56b
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10784 bytes
SHA-256: 68a4e6ded7b0eca3af0e990f4c173aae6266a60d1fe3f0a2a2817bf6df0cc8d0
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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