Malicious PDF — malware analysis report

Static analysis result for SHA-256 a038f7a537353fbb…

MALICIOUS

PDF

79.7 KB Created: 2021-08-02 13:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a03a487581574ebffcc1fa1c978014de SHA-1: 2ed5de38ea8bfeb3d19e9cc6963b416c18e03d8a SHA-256: a038f7a537353fbb0a3bacaab6a304854272a362a6cbb74b7be3fd3ee8586bc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=minecraft+survival+guide+villager+trading+hall PDF link annotation
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/funotabel.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b7b45518---mawibonakub.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee56301daf---41892809898.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q90e080a8aqqj5mvgak954o2c6/xitadipixeponomu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/guwemizalirovevu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d926b22641---55900076585.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edca049561a---xudizadufevojido.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e966caef5a33d22386a9dd30b1bb7044/58490444741.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/63883633826.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c55097b652e---45007489921.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210801122422_63535649.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/95622651151.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/36965984248.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6419aabf1ae4f016a96ab468129988f6/94848819136.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/85229879951.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/51306046853.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/52103395548.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/wurebiforof.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/13504561392.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210624_00E8415C94C9380D.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210709_044130.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bef071861d7---fitefijemewawomeloduga.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b851e4c3---punakedujetuxivumikidowu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d72d5e4e880725edd87ff4c4d0807a7e/pifivosoxuzimarotanekano.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pikesaxorosasujojimu.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 10796 bytes
SHA-256: 19152ee491e3855165eab72f3ca21730ab4df96c80e402d808d7af9eeaee2d77
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 16164 bytes
SHA-256: ba36cd7302af85e4efafe28384199f1ceb14405ab2474afb4d665810ef5d8c4a
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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