Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa599ebea692b3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 12:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d817f8f1fb7960ec997cdca091eac20c SHA-1: a579d4d0ee2de1fbab8d9af05138b205bd34a958 SHA-256: 3baa599ebea692b37384a195b9b5597493338c52d9e6d8fbf82eb38a3b0dbe62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://smidgel.ru/uplcv?utm_term=sports+tv+4.0+apk+download PDF link annotation
    • http://digifast.cz/userfiles/viwebezepowonivupi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136399d3871f---17435265840.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/sigofogitadiva.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/vuxexuwoda.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/87664198476.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/36514716212.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090510182230.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/86575308271.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fefe5fd98---86768456267.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_94CE6E7AE18B8F93.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jojubuvexozoxanaxa.pdfIn PDF document text
    • https://mashura.co/userfiles/files/jisimipebotunan.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tawonuxigifovajidigipebuw.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/99848899868.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac88450a82---7722069694.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jesuporanijimama.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae66bb56e4---pifofaku.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/91030214849.pdfIn PDF document text
    • http://orderkai.com/uploads/files/71103350862.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/05d61c4c9e01fe5e40fd8cead57f881c/dasozulozukusan.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b82fd1f4c87871f2438d61e971db7ee9/69504481596.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pelipopuzupexomubetixixod.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/rupogoz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9379fd77---zifagumeleduralafapamud.pdfIn PDF document text
    • 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 18984 bytes
SHA-256: 3db42c796e38a0e1989c7ce013aa2e6700efaa9b75f0d74d36d6fc6d7b75a08b
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 10748 bytes
SHA-256: b51b88ca135896575b021b676e960d14d24bc261bdcd2249c09cf63190c40885

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