Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b4f26c1156f32…

MALICIOUS

PDF

81.8 KB Created: 2021-10-23 06:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e42335f395ce21bfeb22bbf59d3e970 SHA-1: 3acf7ebe92c547e237a29fedd55aa475915bf463 SHA-256: 876b4f26c1156f32fd10bf8a0bfb3d48cef4689aae5271a3af379e30cd160df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://morakothotel.com/file_media/file_image/file/mupibirugafaluropiler.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a7c1212500222f1761f93220b8ffb5a/70033904106.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/daxolalosima.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/netalupitulubalewudevoga.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/rinufinubolufijagimoxiwaj.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20211013202625117.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161705861d083d---tazanol.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/10714902653.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/wiwidux.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/kopamanunijonedapusofovam.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/bojupivewomaxukofubow.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613701352d33f---47603918677.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/14672476475.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/20677630404.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1616c462728d79---12003156568.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gipepigugolozuzaxanepu.pdfIn PDF document text
    • https://lecachet.fr/docs/files/gulepokimaza.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/bixomepuvonewelova.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cjhoelm134ph92duf3dkdmuk65/60855841770.pdfIn PDF document text
    • https://rosycaffe.com/file/89501239622.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d4fb43ddc2a50633849100fdbbdde684/gamok.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/wupoz.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/8258223456.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144e54232540---39600759985.pdfIn PDF document text
    • https://petek.biz/resimler/files/xarixivijaletulazobox.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=how+to+calculate+national+income+by+value+added+methodPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-sIn 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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 10864 bytes
SHA-256: 703706dc19ce9eabb9073bbcbb12e598ee30c4b6cde1fd593586d3f30291b1ca
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 18816 bytes
SHA-256: e3ad484ba956dd7033064d842d9d6aea118dda95e8a41b602bb2ad33c0350dbf
font_02_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1