Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a23a91406141d5…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 00:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd4605de9d78061dce0137de5cfc279 SHA-1: 348483c102d512936b7c52ccb6f3a7ef3cd09a19 SHA-256: 88a23a91406141d5a16318dd506b317f2bd164926cf4b7855dc1be372faf9c72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolujezogivekemanosijeji.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c01b3033---gajibumov.pdf
    • http://whalesart.com/uploadfile/file///2021062606142986.pdf
    • http://hnsunnyfood.com/d/files/52750303235.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806089277ed---mufujanagavagidu.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bd28571dd7ef66558daf9c9365f1ba7a/12339633998.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3211ec623b37385e46aca740e3ff822d/32317667770.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e369e65e216cc5cec6c48b6f5f6c68db/namixijanokaburemovumiv.pdf
    • http://leaguengn.com/userfiles/file///81200923732.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7722d06c37---jebidezome.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fuvufirud.pdf
    • http://byty-pardubice.eu/UserFiles/File/38655978651.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e07fcbf---gufomikuz.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/h960n2s23t2fsmgpclvkvo09et/webutok.pdf
    • http://gramercygrand.ru/files/file/fujedajitawekeg.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab1f6672d1bbf359beaf794b89759bd1/tewibux.pdf
    • http://pressvaluation.net/userfiles/file/febomizagivukokipadogam.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a970101ec---lenibutu.pdf
    • http://extracam.es/app/webroot/arxius/file/sibupa.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5723ba346c---10298491736.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de44db8e75---kivugivarupijuxukefugudu.pdf
    • http://ajisushionline.com/uploads/files/36883205342.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f5eb9df---48776731839.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/15817361920.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eb8e798e589c1bafc6f19b3503a5192f/20529753354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=attention+deficit+hyperactivity+disorder+symptoms+are
    • https://medlineplus.gov/attentiondeficithyperactivitydisorder.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f793.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 16792 bytes
font_01_sfnt_off00010faa.bin
f22d854688cdce5eabf4180863629866b7e98edfcf35a0a2674657acf24dc8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 11000 bytes
font_02_sfnt_off00012919.bin
f64f23f045d746a7f64a463eb2a37ac3f332d9a16a02f477e797e2ec0218de12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16940 bytes

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