Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da033fc285fbe3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 15:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c636372a2f98500760aa4b1e5d3ff3d SHA-1: e28a3817ecd44c30c77a3b6d0a8f68974e04b960 SHA-256: b8da033fc285fbe330a7a8bb8c672df64c1f1218fe3c09ba797196b25bfbbf0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' in some URLs suggests a tracking mechanism for user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://4bzsoftware.com/Images_upload/files/87366260335.pdf
    • http://dorp.pl/userfiles/files/75844730592.pdf
    • https://egyiksem.hu/uploads/file/60352736006.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/15047264283.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/waxexalofajuzenizefoviba.pdf
    • https://livre-art.com/ckfinder/userfiles/files/susikaze.pdf
    • http://leguido.net/files/56987569691.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b8b687fd---92829546550.pdf
    • https://kawanmto.net/contents/files/wawovufesit.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/21cc694cfb33ec9512faaaedb3e58fec/salepobikiziwe.pdf
    • https://lentes123.com/aym_image/files/zotujavo.pdf
    • https://jensbrode.de/files/file/39933557895.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/38569040571.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/zamamevexovurumopalax.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1i7pmps3ufcp6orgo1gnikf5u3/79792601043.pdf
    • http://odumakus.com/uploads/files/82743638440.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eb96953dca29cc33a45c18265d1101eb/54162940261.pdf
    • http://xn--q20b13r9leepaeb.net/upload/file/202109052216323242.pdf
    • http://rajasthanmetals.com/userfiles/file/28273799256.pdf
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210906_AFB6AAC7EF9FD398.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fairemail+pro+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccc.bin
3ca1c14089f502d17f777fc4d7dcf4d252f995a2a12f79996c006e09ff368d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 17424 bytes
font_01_sfnt_off0000ea3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 16792 bytes
font_02_sfnt_off00010251.bin
fc662e17ccfcff31f0571d9d5f42bf72474641d3da93febb7375c71f0d21384a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10112 bytes

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