Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e9fea63cdb2759…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 01:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24976be08a3945cde689133296ec33a1 SHA-1: 971ee445335c68600d4618c456057e0165e79ab5 SHA-256: 78e9fea63cdb27598c724dafda266575fafff4086b75d3ffeb3db9eef64cc335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection of Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution campaign. The document likely serves as a lure to trick users into clicking these links, which could lead to further malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=ethics+and+the+conduct+of+business+pdf+free+download PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824879f09bb---3899612635.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/82286483651.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/55e8d50ee757db5ef9ca1af91e7cca6d/73304146239.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/lavefigekiraratepuxulum.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/87819876601.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96b2a768b---dogujelagizoxirike.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/dukamexuxewevolog.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068d784360---pazutiwowomew.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dd6d591bb058bbee6d2ca0b24d48dee5/82730526334.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zobagesolewurikebutekef.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559f83cd65---57301986942.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b763c29322---bojegenifarofovob.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f10b60e8665---xexubidizovupefobade.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/6336973886.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/10602401649.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3e512ec509e402139fec55e1218bd398/tuvafexefuxanojifatigonak.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/golexegitum.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/92479529410.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/na6bq02livajjv97t1mkcmouai/pugikofaxere.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210824003344.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/tutosanamiwuzobanuwefalar.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/9767297159.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/14247358124.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_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 18844 bytes
SHA-256: f34044641f35e1d3328fc6889a1d1031aed1e011e246dcbba8cc7d6d4020e66c
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 11028 bytes
SHA-256: de2dec15ba5e4e422dd0e9450f602d911c9842f6e87fdb7a72fad47495b9a300