Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb948f8208297dc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 05:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37b6386848547dc8fd2c4bdf60abefb1 SHA-1: 67b64cdad433d39384fd477269e6df82251f20bf SHA-256: bcb948f8208297dcb753be90cc0c5d90b0e18bbb44bd4f21e65c64351e539523
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://handinhand-daycare.com/ckfinder/userfiles/files/nafonujatanuse.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb7c23b3e---96793764771.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb29bc911---78598499827.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/wogaboxiwifogurof.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156999d360e---62977549978.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mitewubofujosuferera.pdfIn PDF document text
    • https://tipresentoio.it/images/file/70712169129.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d99c0a9f---miwilo.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/24579117086.pdfIn PDF document text
    • http://turatabor.hu/media/simotiwadafoga.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/t6d5a35ee18g0q7dr2gisholq5/tubamajegerirutesanejop.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nodick8eo6pnsne3gf90n8jvk5/26728295537.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/90309025155.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4ec85090---sesimasoxi.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/64428378789.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210707113556.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/73592575758.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/13799956190.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5473e1019---ledumivamawafitebipakuj.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/89896594054.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512000429550641.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/411c4d1141db36794778427a7b5a57b7/nakupavemilusutumaxef.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa590901e4---46022559912.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/63321789348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=15+inches+to+mmPDF 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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 18172 bytes
SHA-256: ff554df0ff07467c19e2dd48bb831858080a3302c3d9ce5de859dc6632a11d49
font_01_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 10276 bytes
SHA-256: 596c416db22aaf79c7e61f2510e1ec2484225b611de7762b44cf29a6b2349740
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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