Malicious PDF — malware analysis report

Static analysis result for SHA-256 18832ff728cad292…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08d147c80150e43777f32b073091ec9f SHA-1: 50416bf32912d699e3795028d0a2c015631c887e SHA-256: 18832ff728cad2923e4810f6a4fda9ad1b9f8215f1a44f58dff685d34df40e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the primary purpose is to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tbsva.org/Upload/files/20210802204906.pdf In PDF document text
    • http://kovacsoltvaskerites.hu/images/file/16967495655.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/mowojawako.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-10/20210710032805414420.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/16/tatotuzanitemopisiganane.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/19889535956.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/romukifixitupal.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/23798009858.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/37075166699.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/63207271699.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/54740707523.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/40cb99123d2279879e2e0c876d0c7433/zipabonaziganonovevaku.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ng69dmplhm0g294f1qtblgb8h4/88855786258.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wokobupi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xukuboletivenidedog.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9110ed---gutukozugiwoxi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1696ddbd9---38564920801.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/24729070360.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/60575620488.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7dc1b1f6d---bepotufurokadugajaxodoxi.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/80218535050.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/10c468f863be567ca27b96777e48d50a/xadizaxud.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0db9f5bb---rivinegiwelarijil.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/105604203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=briggs+stratton+pressure+washer+owners+manualPDF 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_off0000bbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF1 16808 bytes
SHA-256: 8cd985fa30a85ead3026ec750cdc51688bd084a8cbc1dc8cc58e385c92c1554c
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10940 bytes
SHA-256: fba0c8c3c8997c0a9cc1d008abe75025f391a76bad211f719f0650d0204b7c39
font_02_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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