Malicious PDF — malware analysis report

Static analysis result for SHA-256 8410439c96a5b4cd…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2206121b810da612ce87e3278efff0ab SHA-1: 8179d213749fb703b4a49d40d29c37bd78076c6b SHA-256: 8410439c96a5b4cd10753ca6603c06d12be96ea46e6e0611d034aca353dff5de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=italian+words+that+start+with+b PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160792abc79c9b---wosufujirokujonomebirarok.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/49611492339.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/wivetoxekilofogakejeroxab.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f05335b6487c65401d17c3f72a4cd7be/kijixujubob.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/masepoguwoxikudejuw.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/22592390367.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2b8769592a94455d267d323e9be7e944/fodifenimofemabefuxabo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/1677897667.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/48693617023.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vomoma.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b33e0a264939e4c3c059556ffc5100b/xumomisulejuvetodo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb19e96ae1c---57638369416.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c07a13365---77848013459.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/7792345934.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/51949995884.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5f19f9e4892d595e3a1d3c0d5ee4497a/dukewazidu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f0657441486---susofekozedumawikaf.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b8fd4fd1---sutikomosofumi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/adf9bded49831edb73a810be32231513/41763426031.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/32924458160.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/97112452198.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a369a88f1---fokix.pdfIn PDF document text
    • https://123natura.com/stockages/files/lulegajowul.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gamegizofexutafu.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_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 10388 bytes
SHA-256: bfdf96816fb0db1b826e2f24f74f8302a21c57285b216f1fbca4ec5995feaac2
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 20356 bytes
SHA-256: cbeda3b705db33c5169dadcfa01075357bc6cdb300ac119cb6c03cb9f2425b95

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