Malicious PDF — malware analysis report

Static analysis result for SHA-256 1675dcedfa250e59…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 22:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1452ca0c142cf149685fb788202417a0 SHA-1: d0c707c637f1f41a1f07488902e0ea0db4456105 SHA-256: 1675dcedfa250e5952090fbac28ffdd25b4195e076d8b6d082f9b71a4d8dc348
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=kannada+ebook+free+download PDF link annotation
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078a74f3f19f---43469981066.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/turukabejokunojevusim.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/gijibumigexovonaro.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/dinaxivipebamurudul.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/negujegi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/purijusokinixi.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/49727138624.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/63862867515.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610258c9d1e85---2012158843.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/77098654594.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73047004263.pdfIn PDF document text
    • http://orlickachata.cz/files/files/23418951855.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba8bbc94e26b14108a639634146b45d6/65068206711.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/6296098628.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/70201123077.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/48932007491.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/bezedojuguturu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d8bfa0ae8d5f849bf6626ebc392de5ad/76066383497.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/da886c25268cfc1584ab7bf9df2968c3/60256754758.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/24272451301.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa8def3e9a---18588541375.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e910104a---92462489113.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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16528 bytes
SHA-256: de525b5cebcb9f2f9a489999992685108bbc891753ede3ad6235589be4012d87
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10300 bytes
SHA-256: 30261ef5504f786db5f8b5434994eb04c1451e7353143656b543eb2c01056881

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