Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc87bb9c748e67f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 22:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ec0b8c5d327f1fb08e558d7f6f1d70d SHA-1: 1e7f178e55c4420a43c8ede249ec858d876ef85f SHA-256: 8dc87bb9c748e67f66da5224e1738f7e133aad054048dc90537776e7f9ebee16
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest the document is designed to trick the user into clicking a link, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=download+five+nights+at+freddy%27s+security+breach PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132072b2db00---pawatabodosi.pdfIn PDF document text
    • https://cardolf.ro/files/ludisiwixux.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/74834844944.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2d606c28b---zowadumir.pdfIn PDF document text
    • http://www.abitacolointerni.it/newsletter/file/kevemuwoxage.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/10167695260.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/53400965276.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfba8597f---99937233855.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/sewugupajo.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/garelus.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/risawijusu.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/91136038872.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/17755636382.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/49145610371.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/18982199181.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/monejupanataxojalureg.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/netajuwitapilebebaxivag.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/judemosamafufurasis.pdfIn PDF document text
    • http://packamate.com/userfiles/wunuvuxi.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/92236220254.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nuxol.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kapaxin.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/13604455409.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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 14432 bytes
SHA-256: d207e127c4d9cd3cf02c4a0f16e307029f0a6aa51639b41d268817bbab1fce30
font_01_sfnt_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 11296 bytes
SHA-256: b25c694906b81b1449ec00e2c0d64e60ed157e8abfed0a55c0fbaf35c4b275b2
font_02_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.