Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b4044b7fa34c6e…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 10:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42b2b85dc9423469f4d89be33b2129f2 SHA-1: 2cb4c51cce8cc87c3d141ea7bc5e3a1c98869e71 SHA-256: 73b4044b7fa34c6e8d100a2b64178f3d75c6100bd19960c615c11611373898a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external URIs and links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or to download further malware.

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://pistant.ru/uplcv?utm_term=so+you+still+thinking+about+me PDF link annotation
    • https://fruzsiflame.hu/userfiles/file/53236556136.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/21481693864.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uhn2531rrt80c2ab8hnd5olos4/muzupofuv.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9npbb8g7e0579dp9i1jfojiria/zajixunekodanebuf.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/rijude.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227169e034---niwiloseradexowuka.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a84fe79d2---wopudisevenazes.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/aa3501a5294ffea4f64e6f9d9ceaf5ea/nifedewevazanunabusu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e47156a64c9d8719c6e3397fe2416dfe/waradifalizobutugoke.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/96404910453.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rigofod.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/28218113027.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/133487dckebolv0uul0ht7e0mp/52387196892.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b425d7d61---xuzavomiza.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fawepofeleleziwujekidipob.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/uusojns54145gavgnu5tfl514p/loxesob.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ssh43ltm5esmahusmp7pgtn632/68302900251.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8r71kosukvir008ccbmb5740kr/29443173023.pdfIn PDF document text
    • https://aedwea.com/upload/foto/galunibana.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/tinobiwuvunumuxex.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/74393484599.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71cbb9eed8---10944337767.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/95044068349.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_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 18100 bytes
SHA-256: 78809146face38ee2b8a83899f1dddd7235d6bda6644bd634ee37b3977f75b7a
font_02_sfnt_off00015f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F52 10976 bytes
SHA-256: 4a94b9d6fe7d77d6c216c15c2ddfafe8b7df5b4b038b4f64fb3cc8bd9cc55fce

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