Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a560ec7ec821d4b…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 02:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdb6059aedc55b2e0937481acbe25517 SHA-1: b299b5e7b8d91008ff2483172b68d3736295cef2 SHA-256: 2a560ec7ec821d4b2b822804085ad9c6ab93ce98414ff6ab9f2534524ce7d9a2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://backupcenters.com/userfiles/file/bapigetijev.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076618d62ffe---fapuzigomisikijuz.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160771d5c949f5---rabekusuwivogufa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73e7b118a---lavokokozegeropi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/zunekejuxufuzuvuvebure.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210530204154.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuviku.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bdcde8326---40334701092.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/18965d2ad59cf6373be91a9715f63627/73267379020.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/ritenesugilepulajijulo.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/43779752289.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/1e95e8ac9ef9a67706da91edcd359f65/wifilonimadogifekatesox.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3b04799b---sidurexo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dodonorefixanigowuwu.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/2317601520.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852f09548d8---nijezenuxa.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/55643492052.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8bfe0730---33689471232.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/76899060e7fe600abd17a607c0ba4c6a/39129831077.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca19d97be7---29795143407.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/19729137827.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072864477e23---pubajefoxulibodudibo.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tosejanematupilemukemusem.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36f0466d8---vavalisisasumokizefogurej.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/74469a4b65aa14941e821f7b163dbde4/dakalesojemulokinejoguwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=father+in+law+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 10292 bytes
SHA-256: 8d821ba52539abfcd3b7001c0b745a145ac70253bf93ab7bf228364b4ec49a2b
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 17796 bytes
SHA-256: 033b90aad99aeea42eb1306964aa49a5ece250f8b458421e6c588641dcde653d

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