Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad351918dffbcc77…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 05:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfdd4f04cead2e557f0965f8c5815929 SHA-1: 66dc85a49cfa6315d225b87411d1496dbe7cc486 SHA-256: ad351918dffbcc776d5a9a4e0d520e1bd50c6b93632ff951e2b3067f15d5bc3d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues about its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad72ccae4---luwuved.pdf In PDF document text
    • https://badanie-wody.pl/galeria/file/durerominuwu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beac368bd5f---79568632841.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021841419256172.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/23674598263.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/3799958022.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/tilavakalagokudiwaduxodu.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/vafalujugosinozabuge.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pibemamulogunavidib.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/86610859541.pdfIn PDF document text
    • http://elitacasa.it/images/file/11468608170.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/sujozorotijadugubadefedo.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wafalirunotibisamizovijan.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210621163413.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a5b55aa---52479376465.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e534b218415---43959566227.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3558773370.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/bemazejazeladi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736c2dc96b9---30562910172.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084227b4d010---40622284904.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/98dae8ab762e378ad7edfe964845620f/99096691129.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3084d9fe---bugibagi.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/dosupewe.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jizupi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d265a9617---8811401554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=business+standard+newspaper+pdf+free+downloadPDF 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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 18544 bytes
SHA-256: 4c5133e92cce45f52c0461773670730dcc024c44b2ea1260c6150ae4f9b7b206
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10728 bytes
SHA-256: bc457b330c465435075150ae9a61d6b2a4bc2b5f9b13f86ae7f94d566a84605e

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