Malicious PDF — malware analysis report

Static analysis result for SHA-256 611f019378331297…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 15:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c2d17c00a9bb3305fd50c484231e6ca SHA-1: bb2d5a0f05a4eeb8ca54c4e95dd33293a5348470 SHA-256: 611f019378331297afc5e90a0d826b3e294959871e5af562432a1ace0139155d
156 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 storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=movie+video+editor+apk
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/71779c5edf53e34e0d094a7f798ab02f/ruges.pdf
    • http://amandamaitland.com/images/file/83378903709.pdf
    • https://vestol.bg/files/file/vifejewosaxobodigusexitot.pdf
    • http://sushistoryus.com/uploads/files/43499704258.pdf
    • http://lideparts.com/userfiles/file/1631793264.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/mozirukawapifukitideb.pdf
    • http://thienlongadv.com/upload/files/madekotuxiruvovike.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136386a76e9a---81303537224.pdf
    • http://chinahongji.com/d/files/julax.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/bevawanijidivipidoxaw.pdf
    • http://didaconcept.com/admin/fckeditor/file/3299902486.pdf
    • http://logicamail.it/draft/media/44032119440.pdf
    • https://atrax.eu/userfiles/file/9000269698.pdf
    • http://jinsonmetal.com/Upload/file/71487975394.pdf
    • http://icsbc.ru/fuploader/file/sogulomezon.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145527fb3eb3---63844270980.pdf
    • https://embassyinvietnam.com/webroot/img/files/52360699163.pdf
    • https://lotte-ppta.com/beta/assets/file/mukexekefabalunol.pdf
    • https://finliz.lt/i/File/36506648971.pdf
    • https://anhhuynoithat.com/asset/files/84926801560.pdf
    • https://normec-cm.com/ckfinder/userfiles/files/25082538761.pdf
    • https://easy2ticket.com/upload/files/63051764950.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f3ede80d---49456206983.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/terumupofapobanibe.pdf
    • 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_off0000c14a.bin
2783650aaa66209355d2f6401181eafe1875f6dfaea2e35fba6b05a85446eee5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 19464 bytes
font_01_sfnt_off0000f358.bin
cb7e5c54df2365428e068beee7628a4626369a51473065b2480e1ad3176a14bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10216 bytes
font_02_sfnt_off00010a70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16792 bytes