Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9850adcb07855e…

MALICIOUS

PDF

108.2 KB Created: 2021-09-03 02:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e040c73c61bf094a533e8d957cfafaa SHA-1: e1129b36cf019e8279f5fcce30c6f369ec8ae760 SHA-256: bf9850adcb07855e73a2d501a875e8eb9e30484d868d2940697d834b1397d6c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=aps+reference+style+pdf PDF link annotation
    • http://flynewsletter.com/uploads/file/4541005098.pdfIn PDF document text
    • http://wernitznigg.at/files/fujosewevelov.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/82269037685.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc70f257a---genemivo.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/23095502321.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xezolokajumezudawifapowuz.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jasodarijinuwilamud.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/73356406373.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/xevegagipakeminul.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506205223936940339.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/75641584794.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b902671c2---dafogititapepiravib.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d31d99fc0da4fa3746b1e6b3c53b4ab1/pivixokezekawakamaw.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fojowufojolajajukazoxalo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d749f06---rotuwez.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a985ebad0---riwivamulub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76600e38a---35803125940.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/06de367f5cebdd21d282e8b9d635467a/12354687696.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nuvavolikunaw.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1cd1a5a0---65688033251.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd064faa0d0---62680496306.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/65c8d7c14bff41361cf1ba84910b7511/89538304138.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/js9f47heoqro1lg98po1e1tmr4/wosetupikokutoz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/62992829465.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_off00014231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14231 18868 bytes
SHA-256: 8179321df56070f5a904e969d27c50866413cf8fdfccbbfdd0a12963f763fd57
font_01_sfnt_off00017395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17395 10336 bytes
SHA-256: fda0f43af3258c7835c19ddc270190f85baff89db49da13204a98a26894e69d5
font_02_sfnt_off00018b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.