Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06ac12491f055f3…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 14:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2435713aa13b8494499cd662b809256e SHA-1: f971ced418f18747fd10d9f89870a805f1a3abaa SHA-256: d06ac12491f055f3588db0c632f3db06dda8694558e1ba3d18dac987a48d0ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of link farms on disposable hosting and compromised uploads suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94b876077---fevijod.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887eb631f58---kefuputavarox.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a245fee653b1f971d1c018202296ed7b/vesakid.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1f65e42f---29198381347.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jo41re4pgctsq989p7jc6cvrbo/fopejogavak.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef59a6e94b---ribamitirivanasapinujeget.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/efeca43553df2150227b10f7d6766d58/fajakemedek.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbaff2aa9f---55073230791.pdf
    • http://nw-line.ru/generic/uploaded/75582516438.pdf
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/famusunokafazuju.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3b64dc58d7b5432fd8da6f49d05888cd/45873528578.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fd7e83d2bf5e97810b66a2c6f9ff327f/88675190527.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/erthi045tlrni919vkp3ki6g83/6464223251.pdf
    • http://dientrotiendathc.com/media/ftp/file/47210319773.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc6c5b246609ad99036ba4150e2dd28c/30718789077.pdf
    • https://castel.ro/userfiles/file/92366211550.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/68924508479.pdf
    • http://amon-syotengai.com/userfiles/file/kilubevifafunipokux.pdf
    • https://akapacha.com/userfiles/file/9504684313.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/31d4d0d8afdedb614aa1915296ccf350/zatajedorowikatabexefode.pdf
    • https://canionglobal.com/FCKeditor/file/66059114231.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d62eada58---wukabisedapawezirow.pdf
    • https://angkortaxiservice.com/userfiles/file/45598973471.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fd59a14c30cbac321a0eea91bb2c924/41986910116.pdf
    • https://rightforeducation.org/wp-content/uploads/2021/01/Red-x-Sky-Alpha-HD-Customary-Law.mp3
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+customary+law
    • 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_off0000ef0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 16792 bytes
font_01_sfnt_off00010722.bin
9f8e9530846e684faf22aad7a9fc88459967d3fde5a6d22d575736211b70d170
pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 10552 bytes
font_02_sfnt_off00011f4a.bin
1e1c59b16ca6502087d1761ce2acba174fb5f118889e01af97cf4d4f661dc096
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16656 bytes