Malicious PDF — malware analysis report

Static analysis result for SHA-256 694ffb46331c7918…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 11:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1758cdd0a7084c8a408646640d0d984f SHA-1: 58800ef2cf703624c211776db775d706106b5965 SHA-256: 694ffb46331c791834f43998fe0de4f2c3eb65c1dd0db0d42669a0e880583982
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple URLs, including 'https://nomylo.ru/uplcv?utm_term=mobile+application+development+project+topics', suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://nomylo.ru/uplcv?utm_term=mobile+application+development+project+topics PDF link annotation
    • http://booklandbooks.com/userfiles/file/1034004485.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/sejubib.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd87aaf4a---ladebikexitopuponab.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d99f871437e448e37057954ab72641de/wenagoruk.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/82490839172.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/92242009438.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e561b2a680---jebulobaveg.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/lolawatodasazijoboguv.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/94868904131.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/vojorodajev.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xugisukekodub.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/68076408626.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/jeniwibivigizavugapifo.pdfIn PDF document text
    • http://ccsl.asia/files/64919973608.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bdf0b822---55074520980.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/30047856237.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/dewujaralexopaxexezobebil.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3490e284d3222b5438a920bb265f448a/vubipa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fiferevaxalesoduzeze.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/88166840402.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109111753567659.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42284913232.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_01C6AF28E60EFBB1.pdfIn PDF document text
    • https://keongracun.org/contents/files/14030003899.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/lowesizewos.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/48941502917.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 17984 bytes
SHA-256: e5588be7ca1ded956980a75648634c3dd617651b014baf3ffe61067ee8f92b9d
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 11004 bytes
SHA-256: 5057d175fac1390eddf2a6855d8ad03a9887b9a6314745367289201167aaeb61

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