Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9f19db65b9e104…

MALICIOUS

PDF

97.6 KB Created: 2021-09-09 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 48af5b59b5116f6c9effa84a425f2c9e SHA-1: 56c8bc8f316e73b12fad1087c6cb560ea4573841 SHA-256: 5c9f19db65b9e10496817eb464f74ab2f2bbe7ab5d57a7a0be3c893cd40a4b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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://huntic.ru/uplcv?utm_term=solution+manual+introduction+to+quantum+mechanics+griffiths+pdf PDF link annotation
    • https://vibangthuaphatlai.net/uploads/files/59341335678.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/46470108852.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/114274872.pdfIn PDF document text
    • https://stopserv.ru/files/file/rewogorux.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/93403237477.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/dovofudeweru.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kidupokanuramifikafa.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/3706151375.pdfIn PDF document text
    • http://archbot.pl/files/file/dopemudodulabawulo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3df5837746eeeed3257854ee268b8ce8/kepabapurafabipipufam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84bebf576---sumis.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/zowesezap.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/50htb7t304tpbtanrbru30920v/20933358915.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210905171516.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/99126798462.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/jirerosoxujilakilototite.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/liribexegawoxexivuz.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/39068217891.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/20162952664.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5865512b9c541f193a34bef9597e09bb/81719770864.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137970366696.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abdfb9ace---21456538447.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/48948064010.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/34637446452.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051028583365.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 11388 bytes
SHA-256: fa94d12959ee2fe39d95ec5ee38a28d2302486edd722227918d56a6f761a33b4
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 25996 bytes
SHA-256: 2138288c122a5773bae6c3561391270989e83b7870fb7b5278f3db979f15fc31
font_03_sfnt_off00014808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14808 16400 bytes
SHA-256: 0dba809cdb1c74b57e4e8a41daee61e41d9d20803a2ba1e6bcf2b0568b05aa66
font_04_sfnt_off00015eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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