Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb6ce85d4fcfc05…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 17:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc533d0e20dea9d4c22ec592ad24ca81 SHA-1: b4b868c4416dc5182a6bb254c021424d6196ad72 SHA-256: adb6ce85d4fcfc0552a84d0c4a8500b668873984f31e31a4481134cb1aa24be8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=the+power+of+now+bangla+pdf PDF link annotation
    • http://royalgoodviewresort.com/Uploads/file/1763609475.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/4038313009.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/dakoxodawivumaverob.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/81809893909.pdfIn PDF document text
    • http://klemanpince.hu/files/file/52542235311.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/godowok.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/tupofuroruxer.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75247354112.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14211811433.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/ragabojotijureterofif.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/10165443776.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/sokapumitopolitafi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/190400913.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/32480386923.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/88632025857.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/75425709225.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/soposarugidilinepiwenu.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/16124311012.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/jesimuwagesus.pdfIn PDF document text
    • https://matricula.arendic.cl/files/628803530.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a3fd40ed---37149623662.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8509a92361d3bda7f29e3670f8a1cc5a/28002630016.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_off0000b71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 10608 bytes
SHA-256: d0a79c63b90878c46e84c087b1b420909cc5f8bd361b320b3e34f31fff00509f
font_02_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 15788 bytes
SHA-256: 78351c545e66a7d1f7091c16554c601fb36a4bfbf06599c2fed11a69c2bd8514