Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1224aed79b01ed8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 03:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ba2be803818812725c28ff106613b26 SHA-1: be6785a3f86d367ad9931ff5ed86046fa750b9de SHA-256: a1224aed79b01ed85b5a0ffabffd4a48e3e6ed9ed949019fb0c92971774aa888
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://krusomying.com/data/file/68066372807.pdf In PDF document text
    • https://motodubai.com/uploaded_images/files/30739098883.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750e15cc78---38412712074.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/37533983637.pdfIn PDF document text
    • http://sdes.in/uploads/xijojox.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/dosunaretafimepaz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11350be56---mabelojer.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce64890b8e---guvujanokedovovazola.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/5132347078.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe84dc7bbf---95399833231.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ug9gqai9f67tj3dt3f9vup5tb0/lorufotezalakuxeja.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ca0fe2bf202919d04441d7520e421d69/4438315038.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/51622968836.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3cd6d8d62---3330843549.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1d1517cf6199a45327bea90200de0b82/zusutadamujulu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/8440253610.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/xarusibexag.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99070fed7---venezosesakadaxogeku.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610440a482842---virobukokevo.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/losagipakoduweledegogu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124316967645---golif.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/41325794675.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/19973566966.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/milomotigaribuma.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/62751997064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=anchoring+script+for+republic+day+in+gujarati+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB40 22604 bytes
SHA-256: 500c3aa7d2df4152364a4f15ed166c01f7c2efc8d7d0eae234883498500888ac
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 11364 bytes
SHA-256: 37182e2b78efa13f8a24512cf1f8645b2752c8f7a3cb37e794d3dcb667d3d7df
font_03_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_04_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1