Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d4a89adbd0a0da…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 01:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6086a50d13d016f65f2d3965cb1e8149 SHA-1: 68ac9a0bd9446dcd0df72d0f8b9115fe798df081 SHA-256: 73d4a89adbd0a0dab54e8849d17923c2d0ebaecadc5d6950df88a9824202b64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://kayapalinakliyat.net/file/kegasesojodop.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/38336619707.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/kituwunaduk.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83878301533.pdfIn PDF document text
    • http://chineseclothingonline.net/File/2386200509.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/nukomiduzexabet.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/tujazadijeraxegiturosoxos.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ca53032---99323697010.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/feviretifugirarofeju.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/79594075048.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210908201645_2088669676.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ef779bf61a22dfaf448c4bf9a0b8dfcd/6502579106.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pepulitupalubaliwaxod.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/11143876490.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/faves.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/75098270349.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f959182f9d3b07282b1187fd72f15519/24590757713.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/dogujezebigejuwifaxibufup.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zukotuzorufifusoku.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gisotevekasowemizuruku.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/77676355544.pdfIn PDF document text
    • http://otczenacts.com/media/files/71097015650.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc66a8ae9---robixividuvamupeg.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/90372466933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tekken+7+apk+ppssppPDF 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_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 18456 bytes
SHA-256: 36bb95c058eda14dfdaef316bb5e72be9ec6ac23349bfcfafc799917bb407831
font_02_sfnt_off00014583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14583 9896 bytes
SHA-256: 95f0aa5ed63ecd3807516c3656bb08dbe19f6b4c1d2302c9b2f4e93fe2c1b196

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