Malicious PDF — malware analysis report

Static analysis result for SHA-256 3728748de1cf166f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 04:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2fd12693bf620a9ddc68a000c8993ad SHA-1: 9b44d443ad4a0627de2b3d3577bf5dbf845e45d0 SHA-256: 3728748de1cf166f23bb4e8aa48fa4869e5b792bd6738f62205f3dd08db0ce45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=le+petit+prince+pdf+french PDF link annotation
    • https://baohohoanglong.com/userfiles/file/fijuvamujagutebiriteridix.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u3c6v4ioihnp1otjtjq8qe2eht/21115871839.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/sepuworojuleluferaweroxi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bf890ddb---tuvudazizuwosuzigabaw.pdfIn PDF document text
    • http://allasclub.com/campannas/file/limevudejupuwukefox.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/66445712518.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p86j5kplhns6cd46c45736ul1/bametagaxizobidifozam.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zulazexizotekinov.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/38232829564.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801c44c272---masajanuk.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202165651119295.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210709/file/28405893383.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210807_042516.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3258ad8d---weleruguxazawitutotep.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5lch1doiafp5tj6tim2scm8eh0/fesasevanitasazama.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/bunelomefereno.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/12474488924.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/afr36t6f6eciavpdmgan6m9ao4/gofigod.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210824_070845_133.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/61491f52b529fd355c2c540248a1abbe/sutegibedanorebe.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/bimasukerujasesariduxi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bntmc04gnkdfegb791b38lmttf/kijofafunofimapobe.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/38408135327.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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 10176 bytes
SHA-256: a57d38d069e0412c5c6cde5eaeb9dc2c66db76eff2354b8829745b5d5a2a13c6
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 18548 bytes
SHA-256: 697ca50a3a7c7a1874e80142ac09cb1163059aac1ee40304e902cc723344f979
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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