Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e7f52c8cffcc6e…

MALICIOUS

PDF

90.3 KB Created: 2021-07-26 00:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18f4187eed4581cdc44847e6ac4d2d64 SHA-1: 98d61d5ea6b8bd88bccaa89be40eb702862f372d SHA-256: 22e7f52c8cffcc6e79436436c7dc0fd44f2e17651f07f8064d9b57d2d2ef127e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://naphotelbangkok.com/userfiles/files/81738211337.pdf In PDF document text
    • https://cecprint.com/images/file/vurujodon.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/91524711542.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424f522400---subukovoku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c2e25478---kumakis.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089948f9a486---71415804783.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/93ef3d50ef3aab00e378c3cf82a2372e/58301508801.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/betategadetesimiwakugadid.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/23514256389.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6897a867b---xoxusugago.pdfIn PDF document text
    • https://puppometalli.eu/file/bovimiwate.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/89749he2j31qpacmaj5r3cv9qa/71872116106.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8553boo43pipou98ckq5ba6eko/wavorujimakijeg.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/lanozuwan.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/viwizidinimumimawixeku.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/kajimusinokowexebubusoxa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da7569d1---jovidu.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/gevonugeveledozibotem.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d8def95f33eb5aa5779e128462fb20af/vikunuritajixev.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1522668c---kamiwefotimezobunajog.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/36070208867.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/tuvawiti.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1322109c61f82bfb3b1db3060def844e/57924297215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+de+tiro+parabolico+fisica+resueltos+pdfPDF 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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10864 bytes
SHA-256: 1faef7af3cfd3807a0c01cd08e5d9a784299e9622ddeab7ae5fca6810901a994
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 19664 bytes
SHA-256: 14ac05eab736be817e25277be498e7e624945f4af702679e717c1be33cbad31d
font_02_sfnt_off00014369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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