Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0447b129d0736e3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 14:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6914f599a796d1ef3015530092e18720 SHA-1: b6acc2b74f100d3d997c60dadd29e86f8fcfca56 SHA-256: b0447b129d0736e32adcbf7b375f75c95ce3fe706b646120ef374b3d511359bb
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 directories, suggesting a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2be5404e2---51044861970.pdf In PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/14014386675.pdfIn PDF document text
    • http://dakov.hu/_user/file/lobabukusapipen.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wexulebemer.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/673136196.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/ludekobenavo.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kigevusixoxorazarobozal.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/jezogowakotemera.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/45534210235.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/wimexurefowilixi.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/92842360577.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/ludezisulaviwevufidalesof.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161315adadb345---46028001329.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gisorujetedikigajozaviwok.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/81345935270.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tikibo.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/powolege.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/57642765366.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/75437116499.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137fee5a7ab2---40586683759.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/1429204486.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/besevafirotusuwudadabi.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907094837.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/70906826300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+kingroot+apk+for+androidPDF link annotation
    • 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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10552 bytes
SHA-256: 09322639768672ad0fe85b5760a1507cccc6dae6bc7c78d78c89dcd08c3063f5
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 17508 bytes
SHA-256: a00c06b328c3670ce99c088d437eb59aaf58f506c2b9c055e839014ef1901598

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