Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fa1ef458c4bdbc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 22:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0438d058a1424dd36349261c4766635 SHA-1: a87aa2f37208787ac2ac0a665887841f6682b502 SHA-256: e7fa1ef458c4bdbcd91b6c7bfa8f760d1edcbbbe714ce08c84fa7b27a14d3e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://sayurmateng.com/contents//files/fomumoxori.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/8040320206.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c616bd083e8---23211109550.pdfIn PDF document text
    • https://123natura.com/stockages/files/pogigi.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/31386398070.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/38415993852.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/lakax.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/43401791658.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/fuboxusumoruzosuvagojigaf.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/76758617780.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qibddrbv28kuhejp5ji7nvt656/xinasutigigepolobogud.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/mogorebov.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacca4ad45---nopesavisaj.pdfIn PDF document text
    • http://sns.hu/_user/file/turulafarodetivom.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c214596a10---89651441674.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/31003302077.pdfIn PDF document text
    • http://livestocktool.com/d/files/41370732246.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/molulijijisevisexiraviw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085e792a904a---76770742703.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/lefuvisiweluz.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/28386704778.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/08e3617b1ad1dfc2592018d8d25ab29b/zisivujobiwofekedu.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/70526316028.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/laligebedudeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=f5+load+balancer+training+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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10880 bytes
SHA-256: 31c848c34509c889327f1b0d2b615d2d2e0e65c49d20b1cc7008a24fa6d4013f
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 17580 bytes
SHA-256: e8ae22e36e563f2fce98a58b6c11813e269eae94ec5ca349ef414da2d0f2483a

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