Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fbc9b207618df7…

MALICIOUS

PDF

100.6 KB Created: 2021-09-05 00:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b218ec15800343529d49cf02a53c8a51 SHA-1: 25fb409bc7e6ee683a7e5b0420bcefb68e91a54a SHA-256: 87fbc9b207618df78a0a0749730a984c10a8274c0b83454283ab0706f56e276b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hanboo.cn/Uploads/file/2021073001052770554.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502021139473431.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e75b43413b0e5293787d9cada161214f/pasekuminawulin.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hiu1cfiv59u8q1rvpfm53hgo93/gajewejegagibilap.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/40168522477.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/lomapavanixuvagadu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/55bfd65210e730648089bcf6f776a0ab/3832663381.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adfeb14732c---86810225184.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f06c1a6ea---2763935959.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d543f842---zegagakevopoveke.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d00656989---vodibamul.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568f73a932---8930968443.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098900ecfdf2---vadezajovojudituwigi.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/nexupa.pdfIn PDF document text
    • https://songhong.info/userfiles/file/77526357328.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/45799591838.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960dba8214a---45766463066.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb88583ca---betolukonaxisar.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/84171359086.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/sajuwe.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5284_20210524043205.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/60340631007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=panasonic+3d+tv+55+inch+manualPDF 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_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 17332 bytes
SHA-256: 67274771684c3f44ebc893e508e4f84be530255fe2d4b6554b1f52ea0605d21c
font_01_sfnt_off000154ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC5 10876 bytes
SHA-256: 9af3e8b429563ad2d1344e549e4e34f117c4b76cff6a7e957a96761ed1fea197

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