Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19212d6cc37ba5e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 17:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a2408c98144c184bffc5f8bfaddfd81 SHA-1: 66b11f553e90d0554f2209a49ffca4146a48a177 SHA-256: e19212d6cc37ba5ead80604ee6560c3eb7d3131e15be70ff0beb68ff6d2bbbc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation and may lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/futujopikofewese.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610071a19fcf3---bazoninijagesizativuja.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a90291083---268627066.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aeu7ff12394faphjuscksvllo4/91552622549.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a26975ce---19839364460.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1b0c91424---disimalusaxuxuwire.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/binepurowonaj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/aaf5ahr0tnloqjp3qtopp1k5fi/9721039702.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/26a82a12f72786a5d642ab0b4818f803/xopode.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613020c1291d4---31665469351.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68504078102.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7fc5f2e0fd4d3f7f30c3fbf499002607/50679654176.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/gevuwekejanol.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a139a491f6c---99853009316.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6f8436f1ab1289fdd4b8cf37210b0f9f/44950380346.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/81736352693.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/40578376255.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afeea7261a---14094894276.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/felidiziruz.pdfIn PDF document text
    • http://djapm.com/userfiles/file/69747644403.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/94854515182.pdfIn PDF document text
    • http://2440027.ru/upload/file/navuvutil.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0386f9369a4487c26c6fa7dffbba5e1c/miranabifakodabofox.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/743cb488232d62467c537a83bc430a5a/7740195808.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/24117859368.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d6efb6fa0d65532e30c23d4e336e39/fuviserabidukepixezivuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+camera+dslr+camera+professional+%28procam%29+apk+modPDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 18376 bytes
SHA-256: 284e1b6a2cb26e59f9dc26b5837c7432f166dd5a42aee3a1e8d1cb7681587d76
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 11024 bytes
SHA-256: b0f895d54bb0576841744d632f9dc7d3278ab5e290d9f449e9714a103c3588a0