Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd575f1086d0cb8…

MALICIOUS

PDF

90.2 KB Created: 2021-09-15 12:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: baaf48773bf5fec24fb404147575b216 SHA-1: 723e4d637a29f37b1bfe2c950b19b65f61618c74 SHA-256: 7dd575f1086d0cb86cbc5931d6fcc9512efca729ad40d733a2af019d14fc33c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aktien-analyse.de/images/File/madolugerabejiditudimi.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3i7953jbmfenkh8eqlr0696k32/858954094.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/lizitigunilowemojijavete.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/79292154209.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210913205006.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/6428621494.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392872838a0.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/milesuporonite.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091009504921663.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vikumuwaten.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/18078889725.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tozofelaterixijilapubo.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gasavevoronasigamepavetap.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/21020032001.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/juxubiwusarawiledujesip.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/didaxeja.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rulasoguwiwapemerosofim.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/kirogigev.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/wimifezinobufine.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/83248535607.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/rakawelugemepufulasox.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/felofokukupufajomurizak.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1e937264---tuwijimebamekawe.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/12424378433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hey+soul+sister+violin+sheet+musicPDF 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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10604 bytes
SHA-256: acc0b6506d3ba39466ef96ce38e0a810c3597be48254beef031e41ce8a75fd5c
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 19104 bytes
SHA-256: 9e8986583359c9a3f525aaddfd3d2e256bd606f851afbf2ee856e0be3b941986
font_02_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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