Malicious PDF — malware analysis report

Static analysis result for SHA-256 db18faa0ceac0491…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 02:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8363e7c903566d169144ebac97ed6d70 SHA-1: 099f7b85801db1b215f0b70cc3d2445e0fc701ac SHA-256: db18faa0ceac04913b9a52462bd1500f2eb98b00bdf8918ecb64f6ed3bd79947
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting a tracking or lure mechanism, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=asus+phone+apk PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131132876254---jenapebew.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/sutarojipa.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/siwazi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/joxarum.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ninarufok.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/zonovufojonifaju.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xuxuv.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kifotofipenapal.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149713f7bfda---4048026153.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/93392873195.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pobewijenivuketekitum.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b341dc0522---90366951377.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/66278933841.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/98516083189.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/zasasu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8b1a2830ccd443a076ad530c8f958d7/2845486770.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8a5alnfeg9m9o30nq655q97ht3/51270457325.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/xedon.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/sujupovonefijixedomes.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vejojew.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/74595513754.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jirejesowodege.pdfIn PDF document text
    • https://trexanh.net/upload/files/22153652130.pdfIn PDF document text
    • https://ikima.fr/uploads/file/94846778222.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/kibitezogowapeferugoxus.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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 10188 bytes
SHA-256: de8974c3b74ff5bf12240d7cacc667fc683899fb6f792622e19435ec0cef4a47
font_01_sfnt_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16608 bytes
SHA-256: 5ae5bf1dd8e701fac59c4be3c48f5759bf5f77ec724f0b4ff0e806fff9cf2805
font_02_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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