Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ee1ddb3f501955…

MALICIOUS

PDF

72.9 KB Created: 2021-08-29 09:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b6514b2a061a03fb96360b1cb32948d SHA-1: 651c1e40d238db7ee40f890c355c2716646d2691 SHA-256: 94ee1ddb3f501955b54795030242da8fc4908a5193324be070acef9d067119f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised WordPress sites and disposable hosting. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b22f0053---binife.pdf In PDF document text
    • http://silverk.ru/img/lib/file/73435915508.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jufuzewilukalikuwem.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/reselezadunikewude.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7391e62ed---takab.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2374613e1c556afeda6be00cd4463113/japegedi.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/53147673330.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210813143608.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hjcuv4u4vk39iqpujd4o8f0jq3/muxopatanuwe.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/34715f83a354a447763ecc0c1dcd42e4/26894920921.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nq9nir07ad027mm3d4a61br923/dekuferifafixasoxizugowug.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/41476562944.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fda1da6fd0ad7f5c0284b630bbd175e2/18254827331.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8a897401e51c67b6950434656745fd4/98646646947.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234359600a8---55824262900.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/43548466331.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/362222d368556b89fe28b5a85dd1a566/lexanuwuribivudukopol.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e71bc399e---89766484326.pdfIn PDF document text
    • http://centrons.com/uploaded/file/117998078361255be172dc5.pdfIn PDF document text
    • https://chp-travel.ir/data/file/jifesijafozijuzalaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608304d300c9b---bigojufajarunibemo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9744dd64bb---tizavutin.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/miduvawon.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/subedusevabawugefuxupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=timp+music+therapyPDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16188 bytes
SHA-256: d2288d5a20e6fef686045f6c50b37674b584f43c850cc5e07ccae138b4e82acd
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10544 bytes
SHA-256: 663cb34be666d2c9a7b6a2ad219935d1e5ff8d8ea6c532c8d331f0ff2e7f3e12
font_02_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1