Malicious PDF — malware analysis report

Static analysis result for SHA-256 a203d5d46ac7977d…

MALICIOUS

PDF

73.4 KB Created: 2021-10-02 10:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca7451bdd513ea7faacb7af4120ab159 SHA-1: fba5011771072ca0bcdf0fd3870ee015a1e9f0a1 SHA-256: a203d5d46ac7977d9723922b9e919d418e69a5d8ea665abecee5607165d20e60
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hqshop24.com/userfiles/file/82265845712.pdf In PDF document text
    • http://ahlhy.com/uploads/file/06121544522.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7ef30cf68510c48f04671f80dd42f739/87298324302.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/11790393570.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/zijasitajalogelelumut.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd4b73b7---52766912048.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36721344280.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/22277970980.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe8901423---wujarataladufeb.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210928054224.pdfIn PDF document text
    • http://4bx.pl/public/file/fuvebiloxozoremebogilejo.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/94140553535.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/35280827731.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/67939885655.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/91911881729.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • http://timebymtm.com/upload/files/jexobuzuseb.pdfIn PDF document text
    • https://nevisnews.com/userfiles/30577425921.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vatapizoru.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/14853150818.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2hdbrhubhs79o3kqp9tgi1fs26/70843775046.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/dhkpfcj866e83pgc9apo46c0do/54788723540.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dulefopol.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///jidorokisuset.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/18678542432.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/34941226816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sql+saving+changes+is+not+permitted+dropped+and+recreatedPDF 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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 11248 bytes
SHA-256: 11251a3f49e75c8e850cbb6e82b20dc72dc246dd499b21ba2c194b5ae456ae48
font_01_sfnt_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 17424 bytes
SHA-256: b13147f4143fef8b0d479dc781431295a367d95cacd44578309ffb5404e45ff7
font_02_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1