Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd1dc6adf423cfe…

MALICIOUS

PDF

90.8 KB Created: 2021-07-21 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ea07deb26680be1831287dfd7d8b7ec SHA-1: 9c80038a48520c56a91b89547a5d824a741610d5 SHA-256: 3fd1dc6adf423cfe4347ec92db5757d8496c4d99f402c763cb7863f9d0f818ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and a link farm structure strongly supports a malicious intent.

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 http://tai-yang.tw/taiyang/upload/file/482806250.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55c2ba611d---wupalinijagokirutu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4ilfeqr0okpblmramrfr3d9307/kuvelodufofudemixu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/roruwudop.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f34aaccf3b7ef0118ed6c12ef2256b7a/37578123963.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/98883925821.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c51a772a---77366951570.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/452b1b8ce031a0464e03f50abc159ded/82668757904.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/15632080852.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/31581169732.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/39943212235.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tibalumutepijulorefimasat.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/famevujiduzagiginixux.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5da72e8bd---78324508852.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/32937243666.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd93d8cb8d---jinuvawal.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/dabutufagusamiwizevo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vitofipinone.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sasqhng4cc30iob4kc0n7g8ig7/rowaxurivevu.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/7966641020.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/37498567280.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/36107079544.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/xunuvegudixaw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g3mpjhpbnvjjvdt5ogh36t8r6/sesefemuboraton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kinetic+theory+of+matter+statesPDF 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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 17464 bytes
SHA-256: c7153644669197a6db17b6b4d58608b46511b2369f79b7668f0f3a5effad7465
font_02_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 10660 bytes
SHA-256: 06245e6162ae54ecd71bb40ba80a4d3ec982bbe134c8e8bb8e526510f21e4049

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