Malicious PDF — malware analysis report

Static analysis result for SHA-256 526a2993616efb42…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 01:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1446d8035a916717c100e19508a6089d SHA-1: 003c53ee8faf88fdf22fe990d2db93b042c980fb SHA-256: 526a2993616efb426d7d2433792ab26ecc37be87c89da6f78610383783b9cdb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable or compromised hosting further supports its use in distributing malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=augmented+sixth+chords PDF link annotation
    • http://iwishop.hu/file/32472085780.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba839ee40b7---67434003657.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561f829b38---fitaliziwofositosasotizo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d1bfe82---ruxebelanener.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160782cf0e1479---48694823371.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/39791370193.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zedajenig.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e5978964---vabuwelosuleb.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/niguvusi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fdeb589285070787e501a9f825b6c969/37406810492.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/89631386368.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e71f8fe93---2837777817.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9cf9c897e31b0ba318243a2df14d773d/kezax.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609290aa94e59---50888153141.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/65640747002.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210513/2105130217041387651f8w7sgw6ptz.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3786dc7b25---wolukagadasisoxanat.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/oon287c1m2ub6ndkehrqg24nbe/vapufobon.pdfIn PDF document text
    • http://inse.us/uploads/images//files/radulevu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/18995445574.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/f23p8f3qqdmv8e3uf30ijpireu/11416795294.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b083fc52ea1---25531541890.pdfIn PDF document text
    • http://llux.vn/uploads/files/41404861248.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/60799579874.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d1d0ab66211da46733198c33beb8b152/48649274686.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_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17108 bytes
SHA-256: 337a096bd570a3d504c30b05bca59c7fb768975ae8ec94135d2858bf26773d54
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 10792 bytes
SHA-256: 80b5f10b01ebd59c3618517ca2e04ab5ba129e33b964a972e173c7e18b2fe014
font_02_sfnt_off000139f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1