Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9370ec2a3b81b9…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 22:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c52e58ab19ffaf05b52f925218b0ec30 SHA-1: acacccbfa3477b7366404b343514e28c74a9fa9a SHA-256: 8b9370ec2a3b81b946bf032511728f4270c2225f809db20ea2dc87153c690f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://austintownfitch1980.com/clients/879833/File/tiwogovalelosedalosu.pdf In PDF document text
    • https://trisyscom.com/userfiles/file/9226523101.pdfIn PDF document text
    • http://asustainable.com/global/file/gasasiw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728fb6dcd3d---80616673423.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/817d6d710c3c96149c2a362ebb78b31a/50582520915.pdfIn PDF document text
    • https://fallsplat.se/file/87896822535.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/21900598461.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e07cdca06---59886205293.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/84612804866.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b2799e775---nefefamule.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/45510067516.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/87773558896.pdfIn PDF document text
    • http://erictex.com/ufiles/files/wovukaxuxowenibawuvemuluf.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/zeronakiwetabesema.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-14/20210614070958498631.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/logonafif.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/o7938me1aaibtbmfc9l617l0u7/wijilineragobuxesukiro.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da59c836257---sasuwajamowilo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/41103330960.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/zebiluliloxusodofid.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/fapefojuwinazegerotewot.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/11608794576.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/xeduvuvulufijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=orbitale+mol%C3%A9culaire+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 10928 bytes
SHA-256: 328cad02e034fe6330e6ff1aa986a057423402a5ace1a9dd4b633648d2febca8
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 23940 bytes
SHA-256: 42edbda756cee0d28bae7d262ae32c39653d533ef9838804c0f761c7c31021a0
font_02_sfnt_off00012be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 16172 bytes
SHA-256: 6faf82083e18f83dc87fe71450a07ecc1b1083ad76a7f1644fc54a5ff42f9db2
font_03_sfnt_off0001418f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1