Malicious PDF — malware analysis report

Static analysis result for SHA-256 915f7127d5822775…

MALICIOUS

PDF

101.9 KB Created: 2021-07-08 03:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e575701959636231437f43d66c03da8c SHA-1: a43521ed2c71b1bed58029bb7862e834e6bbd907 SHA-256: 915f7127d5822775a3aed23f2d69116f9c49957222e10c6f0349796a89b86a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=causes+of+heart+palpitations+at+night PDF link annotation
    • http://alumcity.ru/userfiles/file/ragizodejasasileg.pdfIn PDF document text
    • https://tavio.ru/files/file/lepetano.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bb0e09c51cbfdeb4204d68e6671b2894/37622528494.pdfIn PDF document text
    • https://bor-diing.com/upload/files/lapujiwafusenima.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/33531e10a3f4002f330ad8e0fe01d4d8/vuwedekinuwotafofig.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0215e178---21621818509.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a346e05b8f665a1c440d1a8d8adab647/6142016732.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vn4clqvq2110mgk0kft2bng16m/82538686980.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a540801df79---mipozogiku.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609151f562732---golasuwififogavowokezelu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/55606856006.pdfIn PDF document text
    • http://rilta.net/userfiles/files/sofiribidi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4344154fef---fibevazozejosomotamore.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9eafb0c---27089667581.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/4904113387.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vpppp4ld5seomqunv35mnhq7t8/fokok.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0ce76a92---femuninerazoxavax.pdfIn PDF document text
    • http://beta-rc.com/upload/files/bopazipegepimuso.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/97840751869.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/30921207782.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6ed4e30b---nutekikisikimusenuzili.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_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14648 16272 bytes
SHA-256: 45d0ba176c0b10ef90e4a18613d4c6898c1daf8a8eff073e43ed907661459c11
font_02_sfnt_off00017044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17044 10768 bytes
SHA-256: bd8a40816fd0b5035da65a63a7b8d990f6602eb2185bc13053979530261633f9

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