Malicious PDF — malware analysis report

Static analysis result for SHA-256 9090c47b9113895e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 15:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8714988a57967a97fe0ce94b0930ab04 SHA-1: 7bca83dfba8ccbebf44c590ee8822b73f56ff49d SHA-256: 9090c47b9113895ea1573e57b6f8e06cdf2543f047e5432a61e7803302c70e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=screen+audio+video+recorder+android PDF link annotation
    • http://hzqljsj.com/images/upload/File/80591669204.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/femolopo.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/sanifulojibiw.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/80830089213.pdfIn PDF document text
    • http://fnathservices.com/upload/file/pemilewunonajezupukot.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xikinotobapekajodigedu.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/vexebonarowuvutoderorava.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/voxetinarupovun.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4cebfb71---64803060228.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbe2c735e---jixefonawasibanijotofatu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/47756661839.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/7003638099.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc343c7bdc---88855551937.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gatuf.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/34376164403.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/bazorizogumojodutoboked.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/bedinowetaxobijafolesuj.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/lerox.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/bujumigoniwikeleguxezow.pdfIn PDF document text
    • https://kawanmto.net/contents/files/rizikisuzideporodel.pdfIn PDF document text
    • http://krupongs.com/images/file/24196337557.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/87999235229.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/rijabe.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/mebepujifuridevor.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/74709563689.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_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 18056 bytes
SHA-256: b8669eb3f54cbf0267cafee042c37820f021167e5a5740bea26a94b7953497ec
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 10292 bytes
SHA-256: 7382573552672415d78637e740339ccfb56a922923fc9c41d563fa4509819469
font_02_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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