Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a4de0034badd6a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-08 17:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa35565b6c38913cde28e447c17df237 SHA-1: 17c0851556a156c0fafeda791cbdb034449d61f7 SHA-256: a3a4de0034badd6a6cd41d6daea48663cb7d4b4e8896983161dd3b3fa6907525
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://krisoc.ru/uplcv?utm_term=cs6601+distributed+systems+notes+pdf PDF link annotation
    • https://szelvedojavitasmiskolc.hu/files/files/61013700015.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/nonalanusuno.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kepajojon.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.pdfIn PDF document text
    • http://htygroup.com/upload/files/lisugogebasemamoku.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/72287820440.pdfIn PDF document text
    • http://ingore.cn/upload/files/31875901189.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/23765485729.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/gipujiwuxamarunukalaxivul.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/079226271a09df978382632bd4846c1e/januw.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/xirebof.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/32822609809.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/55703029634.pdfIn PDF document text
    • http://wamer.org/userfiles/file/sidabivevax.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904125501.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pixewomagegelaxenuka.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c9ebfb2098acd71d18ba9ac5386578a0/49838015071.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/bevadumatokope.pdfIn PDF document text
    • http://domplus.su/userfiles/files/20530217240.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5f9a72e6---84840481967.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juxebo.pdfIn PDF document text
    • https://network-italia.com/file/64565860639.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dezusogosijagijasepido.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/74375598857.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_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 11180 bytes
SHA-256: 3c279d51211e373b1889bc0fd995b5f5d084811ce75417b1fa6c851dc85c8bd4
font_02_sfnt_off00012f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1A 19428 bytes
SHA-256: f7104c575791b433a81c89cb6d0a9dd2f5904ff8abcae9b08b13f90dfd3ace0d

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