Malicious PDF — malware analysis report

Static analysis result for SHA-256 444238b51fc239ae…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 20:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b21589577a5f3b4149ffef4ae87e8ba8 SHA-1: 16ff6f982d0937abfc89c06bb6754942c36be67d SHA-256: 444238b51fc239aebf26d59e86d6133626f659fb86623feda5d109a93bb83230
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely executes malicious code, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noihoithanhtuan.com/media/ftp/file/51985668387.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/47434406613.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/26196124441.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210624154923.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c430c2c03---pasawepadejowamoposibus.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/liql9r9n4dcckkj53vrkgt5o8i/18053088958.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/kijidirefopifuzimif.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/rijukazuwipakujebidezu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609753e2cd5d7---lewapidukapavagug.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/90951375209.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7f10dc54---geratikipurixefilubem.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922b7a5503---24830552140.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d35a59f5553fb1e346445366d66d3870/fodopozesurodufena.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4db060e865ef5147eee6a164dbea2c17/jixipewiwowoti.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gewasigijigesufizob.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b552b8a0732---65199398665.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/d3iskp9rvbt82v6irij3oea5g6/23094747755.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160823a1323f6c---34921919649.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/578cd69afc972bea079f4a9b38bdaf78/xurowenawa.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/migepevubot.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/84841175082.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3a69915c---81038492169.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/96723331538.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608090fac988c---941525748.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tizironurofubelovamig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+spectrumPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 17728 bytes
SHA-256: 329a67da082bbb965de8e1c185df9aed4ffc8174d643284d0ce7263f2adfcd27
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10464 bytes
SHA-256: 4449d4fbe6bdfd49003652f6ebd5d53e3c3576f1cbfc9a183687e81009cc6c02
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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