Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a508f59c3e924c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 22:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7404575b9b170789572c880f618f3bc SHA-1: 34c7d546ff7046e5ace148f5a63517902cb1fb1d SHA-256: 50a508f59c3e924cc5e2c14f03320309d9357cf3f8de90b34839c6e8861b9775
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=gta+san+lite+adreno PDF link annotation
    • https://ip-pharma.net/data/files/fazidawiviwinuvoguti.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vafukagudowopopowa.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/2288706664.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93164616926.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065841d11c---nuzarizod.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/gujirufulikoraxuser.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/22334186284.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375495eff37---vufemusodijawiwusareg.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jonivisilelepagokevijele.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/60788665944.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/28886241820.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92459323953.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514ac347e86---97211826871.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31861082799.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/29004781237.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///jadukivasax.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210905001435441017ouwc6.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/kukenadu.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/lufanotumovoziwajuwuvawu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf2d0c466---50512925194.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c7145235---73757655150.pdfIn PDF document text
    • http://gojjang.com/uploads/files/20413770923.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/41329664044.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ttn68032k25pldssr8osj86d23/27971170175.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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 10280 bytes
SHA-256: 839b9c6620e17f0eedbc95f93dda7d5a3f7087246c8ead3204c4eec139784999
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 15656 bytes
SHA-256: 742c422b8fe65cf57288be01cabd35f5264e30f222c72ed5569d2ca70ced925f
font_02_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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