Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a7a15e61f3c725…

MALICIOUS

PDF

128.6 KB Created: 2021-07-09 10:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0e445fa52c9f4c61221b190ff3efdcd SHA-1: 065a15f2bdbf7acc668b37a0f44551e0f3258a7e SHA-256: 16a7a15e61f3c7252f1a4e17292987b2d07e8dc828e1e33c7e963fd1f192506b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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=susan+page+liberal PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b613b1e19cd075f7907d4faecabfef14/boxinim.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c924ba9ba3e---vifuzerufamurujowopapataj.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a7d291df611fecccc5c4e0505527e90f/wovanawozasega.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5ee56cb918eb3a51b19297b7ef11f6a2/nogebizodu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/62607108261.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/lapazowemewazovom.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a98977eb4---88081921611.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c99fde28c7c7ed97ceee2c5b6bafdf2c/15747827975.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/mejunovukadefufetu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9664377b---50077419409.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/31735843027.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b791ae0383e339dd548bb2b31835b732/gowewoz.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/35679331232.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/89e4b01196204f396d66ad84264e4096/94190911429.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nuxamanujupe.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c30d45aaa763345866f013e6b95cdc16/tozatukusajobozevataborut.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f24d04fd---kubufusuxizigopo.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/wesuzige.pdfIn PDF document text
    • https://wittnebel.dk/file/41359947917.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mjm5t1a9tbvu51lj1hpmtmcqoq/tudaratimow.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/84444476133.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/25374072703.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ab49c0f0---jepogatunorefupujage.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/04033523939447bd033bac3c92413586/redasopawujato.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/mixarogiraj.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_off00019476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19476 18720 bytes
SHA-256: fcfb0206771527ad9117be647f787012ab07fe5ef21f12281a41867b416167de
font_01_sfnt_off0001c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD7B 10524 bytes
SHA-256: c75a8a6ae37f8e7f0a06e4dbc81ffb0325acb1fab6601864ec20fdeb644df9ab

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