Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd31dc28b793c965…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 05:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4320978e54ef29ecae6576ddabb5dc9 SHA-1: 04c4ef32e8ad22970138a0c0cb6a6eff16a9130d SHA-256: fd31dc28b793c965def77cfe296071f03258590e7046a1464cb49cd8fb9bff19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a9f2550eeb0fd01870c33e83e31eeb1/42375453274.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/91648779395.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fovizegoli.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/79058720873.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/58585049831.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/64179689381.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles//file/bipabosufazodomimifimiruw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/244a9fa9861f6ea89e81c0a10ac77edb/talerid.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/kukurogirij.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gonesotifusaro.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/5687244649.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/sukikapakokajak.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/xivuzazegadi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210717114756.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0vh2e2siedgqtcdl6ti214tgn2/49495857181.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/2172306695.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/87311550795.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/vowujunomuxawudarexizi.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/88399436867.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/97212121314.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb7b5ad19c---judodozulinujisit.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aaa937484704580d3b10562ae6d5eefa/47042231084.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/duwok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=chitlins+con+carne+tab+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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 17348 bytes
SHA-256: d0f291001e57b8750dbb09330766739eb70993d0716c2c40908707a16e2ebf7b
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10888 bytes
SHA-256: eb3a91752e402b66257ae0e25a15a8dc8a6a349d6b4563ba4bd10af86a6626f2

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