Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbc8ea4bab84cf2…

MALICIOUS

PDF

81.9 KB Created: 2021-06-13 00:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3e635f90c76bc76e6d6807179a83f054 SHA-1: 5dc5abc5538da5d2526ff851ea8e31793d85c1c9 SHA-256: 5bbc8ea4bab84cf2d56d93382448f5e7c9d1974048f9b0e1961478513f002752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/uplcv?utm_term=8th+standard+geography+book+in+marathi+pdf PDF link annotation
    • https://seitonsolutions.com/ci/files/tusavizasen.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2ab76601d8639de4c62aa6df98174315/tifolubixobiwafegexum.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bf04cba9---48912607307.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/32840791356.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a23297e50c94ca96dc503e4de4eee41/titobuvedopukugaxopar.pdfIn PDF document text
    • http://www.toptehnik.si/images/18770404268.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e7700b07acb608f9a1e77cda561e0065/33452025629.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9ee103859f8faf7e44227021b01e758b/savumozu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bk7mhjdg5up65d9uj4gvfp4ns6/pivadapifobot.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/48372148751.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9f8e286cd193550c3ce5e93b83dcf99b/karenimezewikuv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ea0e304d4b041e34a8c48693df4684f4/kamiwadusadabik.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fobenowetonufivedusuku.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/nejago.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fde60b40035f7d4f7e6bde5f570097e5/nugukewubodef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5616 bytes
SHA-256: 12075ec9b02153efb0b32bd3e4713ca67c5d0614b5ca23c761a18141b9e407fe
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10648 bytes
SHA-256: f72ff689fec5fbcdba01c1c4251c91d59001b75cd97b2e8a93ec0dc85940ee57
font_02_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_03_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 4372 bytes
SHA-256: 2f8a48fc146eaa3fb356ca326f1544d71e18a86d1489b0f335211813e828d79c