Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c934763025c22…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 23:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 963d9bd6f40b6a5cda81a36358f5b4ca SHA-1: 19fc727e792ce0367c4ea9d0f744438d400b7a8e SHA-256: 5f7c934763025c228270e412597ad082ba1f95996a4fc88ffc70b6a3b4da0c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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=spooks+greater+good PDF link annotation
    • http://fernandopelosini.it/userfiles/files/78620432132.pdfIn PDF document text
    • http://etre-belle.su/images/file/mujakifuxaziruvepulemoba.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l55icldk0h264lvienusiv781i/pedimititenenig.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6e1dd37---71225649064.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/futimubebivojukiki.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/fukotexobodasope.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d33ce8695c2---zakapopizexuw.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/3389237069.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607630cd4cd1f---50463995266.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/mekarulo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b0ed08f1---fekaxonitagos.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7c7676b0---robojivexavobijapolomuz.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datogediwoluduw.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a876ea09---difanifazemusufub.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089506eebe13---mumebowesizizatikikobaka.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/77190077491.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/mapugovidifo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa23c11477---lisajesifakov.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8028855046.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/83153237167.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/pinamijas.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4072e0a0---42835864101.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef29a66ab0cc1ad298c8147fc0725c5b/jufifimitatikanubefu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d2281714d1c---lojosimerokokujulavo.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/56585251633.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/88155837686.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_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10492 bytes
SHA-256: 03c97a57b967bba52b66393dd563b928cdaa202fde7187355b33adee091766f1
font_01_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16868 bytes
SHA-256: a53c721dc844e151607d1538a3c7eb015a000ef3342279466fbef2b1820b4947
font_02_sfnt_off0001436e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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