Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7a4a5322fae99e…

MALICIOUS

PDF

131.9 KB Created: 2021-06-27 03:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6d2dca5a3aa7a1445e241894fafa3cc SHA-1: 331e872a06da0e9bb0a3b61be7330b213d4420b2 SHA-256: ac7a4a5322fae99ecb91239f9b7d3eb41515587fd712c72f4027d16696180d2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary intent appears to be directing users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://vannordenvastgoed.nl/userfiles/file/vipani.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47864cbff---25124641826.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d1b138a0e0721ad962e96f5a62be4cd3/86671796022.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160749f999ab79---8091021565.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea4863d39---82881070542.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a7eb81e68---41328948816.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8dfa4f6a---wamus.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/icevk15d0ura8naij9rrld3t23/5621155058.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/038120ba769a405124772b3e92a09e06/pesofupuninu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607678bb9055e---38168125331.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/fajodu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn3aq8smn1tj1gv7vfn5anh4h3/96486940860.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2483e26f---82599931330.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pib1m0nl7c7jkig6qi1sq5uss6/78921506597.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/badetabebisupa.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8e750da3---soxusowupejid.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/88701618989.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c7f00147---23932619202.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/91273035105.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/95705544243.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/rikinutasusaravinim.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4n9r4t771vqd1h0o3cla910jv/50275487118.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gezetomubojagusom.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/wekepideforoxowemigoguje.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/fva4l86v9lmv35lm2acpb7fid9/93024239573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=drinking+water+before+meal+is+good+or+badPDF 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_off0001993f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1993F 21628 bytes
SHA-256: 342146d298fdc8276046b56e4e6696455ab95f19ee3afcfcc626bab3568a5df6
font_01_sfnt_off0001d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E947 11016 bytes
SHA-256: ee1290f0a8d6b891ea7825f7396e41420440d39a9797bd4b8da17504b5dfaabf