Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b3c58dcdb7442d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 14:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bcc7710eaad3b65cacde79b17f842d8 SHA-1: 25fbe2165f9e524cc93aace19ae0092e0a685598 SHA-256: 08b3c58dcdb7442d900c000fcc29ca15a6286b14f4c3a6a780a997f2598912a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://strechybenesov.cz/content/jafijebuperefakopew.pdf In PDF document text
    • http://azizolace.cz/images/file/53343176007.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/rudoxusufokabiwu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/de470f3c161c56a57d15adfe68a6fccb/kinumabasof.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h31qq9t5306t56quk5eke6mp8m/fevajezegaw.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e28353a292e04c35ccabb695ed068cbc/70223157607.pdfIn PDF document text
    • https://bloc-immo.com/images/nofebitis.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f9293dc9f282154b446b1dcdae8a464a/tigupematefazuwomi.pdfIn PDF document text
    • https://aneri12.cz/res/file/15631950076.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0db49ea135395bac32dfa1984ed9d505/84812608633.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ab617676e58cbca59a6a092472a6f71b/matifi.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/70426653304.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/23699935399.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9a1db0416d65e22d3f5bc37ac7b5094d/64184904772.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zokadilezixarutezanef.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///62059505219.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/65170184582.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/ragevogelijaxone.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71528436829.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/regobagam.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/63611762463.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jaxemuxaf.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19353943f---sirififelipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=centrelink+rent+assistance+form+download+pdfPDF 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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 16856 bytes
SHA-256: 16da80a1f901f4fde831e4ed49ddeb4a8ca1951fd5396949d16ee2ed1db2d61c
font_02_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 10988 bytes
SHA-256: 9956d743f207c08d297ab88ae510f56598d1fb3e22bbe99e9ea3c9f6af236d1d

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