Malicious PDF — malware analysis report

Static analysis result for SHA-256 33642cb50518c655…

MALICIOUS

PDF

222.7 KB Created: 2021-07-02 13:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2dab0b67db099261a910e963328f8b7 SHA-1: 54c1459c63f8b2197796fa4d291cacd33b6ce179 SHA-256: 33642cb50518c655a7cf18e302b1c9276f332826c4a6016d9ee43d3908c012e1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and SEO redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=stephenie+meyer+life+and+death+read+online PDF link annotation
    • http://balogmihaly.hu/UserFiles/file/ninabenuzafowoxo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vlih5sklvkounok11h80or242h/84190934766.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd6ad6377---25744578473.pdfIn PDF document text
    • https://irantruck.ir/data/file/93985848265.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/ruvefaturuxadeponuw.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ca9a1857f---11669603095.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/wixaleburekorozutexezoreb.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1a77fda74769f8e90fc6ce57fe3b5926/midomigidokedupanetid.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160858288405a9---gulogewupimiwigalarukexas.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e427937728---tularofufininidumeres.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/xiranenot.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/luvamu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dudogabopobaxewileralef.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/86fb03a91656045fa6c149ceafaf2c3a/40301575738.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/dea2dab303bff9e20bfbcdd89c34efe4/44519918061.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072136728b77---63734562065.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/13673459096.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b926752e---sodekatux.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/19c9aec518a346b82c31f91fa218f5a4/libutejalavebuzubewimosuk.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d09365f3bcf1fe66c7d392a80862218a/latitowowuwetobakogufox.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zufekat.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/69fd30e468a4d797699163d149d6a8f4/9704949264.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f32a432ef635c0c7ab00ed4019d87cd2/90037249917.pdfIn PDF document text
    • https://cristalensi.com/public/File/98757770622.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_off00030d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3258F 17812 bytes
SHA-256: 4047e8e0e404a08188f9d3488a8f6eb8d31fb32c80939933621bd943fd8ba6db
font_02_sfnt_off000353ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x353AB 10784 bytes
SHA-256: 5707ad9f1677967d8944e415e53668223604d13f5d7929160144c14deef058ec