Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08023480d1603f6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 09:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e45e15e968970c23b4cfd332dfb45c3 SHA-1: 83e0c8e707c8ced178974695a93cf5d10900d5d8 SHA-256: a08023480d1603f618b24ce4b0fd6a4fa66dfe3aef8b121d660ffe1648bd1294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://globomax.eu/userfiles/file/67859092345.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/siribudiwulojovikajozu.pdfIn PDF document text
    • https://noventa.cz/media/files/file/midogixe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf3e80e27---57097799717.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/19030931991.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8914dbb32---fimekuxatof.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/24624497696.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ditoj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0579ef3be0---67594329840.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/31cc267cb40a7204826f0cb2f2114c99/sulupawebov.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/dugovexivokajajukejivu.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/83215874052.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/658eb7d72e81e7cacfd5bb87646c3811/vigodimekokuxozotufuzu.pdfIn PDF document text
    • https://marigabung.com/contents//files/sogebarefago.pdfIn PDF document text
    • http://unityproductions.com/upload/files/rinesiduferak.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/83075695432.pdfIn PDF document text
    • https://simorgh.it/uploads/file/96789551591.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/b8c5b5bdf43741a00bd4162ee9121534/rekoze.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gimewekotajewagake.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/dazuvirexamamoji.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/ramokojob.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210719_023508.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6809cd92344b5cf64b5623c84e12b04d/60158279984.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/legimawimu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cab992ad058c716180af29d2590115c/moxidem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=used+to+love+by+martin+garrixPDF 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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 19036 bytes
SHA-256: a12d49b1916a60f2212ebbc146697619eb4c287506fb8e842129d82ba07f963a
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 11020 bytes
SHA-256: 4b181f4a66dc7512255e554f5e941a8ade73f3ce9252312aa5ee3b13aeca5b11
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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