Malicious PDF — malware analysis report

Static analysis result for SHA-256 f622593b0835c4ce…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 04:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92172adcd86357fae7cc5a4485b6868e SHA-1: a786c02ad4f17bed204f020ae2d5dcb13680a6be SHA-256: f622593b0835c4cead92c4a9e62a1c4496984834f6088603f4e3a1f62b160ad4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised WordPress uploads. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=it+has+been+a+while+meaning PDF link annotation
    • http://hyundaidongdo3s.com/images/files/sufikemesapugikizalokenul.pdfIn PDF document text
    • http://apart1day.ru/file/35671820664.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nemufakenasikox.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/luletazotonezugowutoxi.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/gasopowupulozorotig.pdfIn PDF document text
    • http://asvpp.fr/pdf/wubizanog.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/vasoguzo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9fb061609d24625905b0c249f49704a1/kovukavugas.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/timofakiwes.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/6858223257.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/2178784268.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/db3c7aea3f92db342f75a56fd11f46ef/86474590420.pdfIn PDF document text
    • http://xprchemical.com/upload/files/81383454938.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32764357151.pdfIn PDF document text
    • https://limsurdua.com/contents/files/gikezutelapidubego.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6122cfd5---96924024810.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/33849929273.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161557b4a8423d---83770118115.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/dogazibezobug.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/77339223263.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/81230040422.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/pobolafo.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/sagubulutev.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/xorogavowexadefebosat.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruwurinafukelarolaverije.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/tewudijagasapivib.pdfIn PDF document text
    • http://meta-min.com/files/45391707752.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16580 bytes
SHA-256: 9d0a6f581a416f3fd1c13f9b73cdb553e3e8f4a7307d771aedf82a01bd37c423
font_01_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 10512 bytes
SHA-256: 4fb011281de6c7818cc56f4e3319188604b07ad8acc9841028857c5439667106

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