Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b1da3dfa619bd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 10:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8310f342ba09563c46acbca88050ee7e SHA-1: a205c7520fb1e146fec9798b98d2a37595fbb5fa SHA-256: df9b1da3dfa619bd2cc21590fc43d98918f075b3ce94e84b6b6b2e9c9ba306ef
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and a high ML score for maliciousness. ClamAV also detected it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous URLs pointing to potentially compromised or disposable hosting suggests an attempt to redirect users to malicious content.

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 http://anhbanglaw.com/userfiles/file/zubizufepatajoli.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091023594375.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/deroxatopum.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/90637587471.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161310130af108---mupufifunabidofeguwedo.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/daran.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17261026294.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/juvipebitonubobudolozasos.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210912055734.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/20179438173.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6b45435840504f10ed52508910f13199/gazojasup.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adb0b065ea---supubojufutalude.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905065234343619.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/15560760117.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348dac76d49---48300032105.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/salisogaredevejisosalede.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/27196349486.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sirilabavuluzagodag.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/43666377830.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/vofofipirologe.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1ormqlcg1ifqr76r4h948svs5/45130802288.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/71296500124.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/91f0bbf8865b560bcf2c0f168558d6d9/33166715877.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/41125409175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=story+of+seasons+androidPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10492 bytes
SHA-256: c4c9e7cefdc9002704ec77f321a2533fbf7dad81492f654cde131308de28d8eb
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 17940 bytes
SHA-256: 111f537b0e274de0c22154866a6b0a68cb1fccb34ebf020c6512fcda2276d0cb

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