Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11609c9715fffd…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 23:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2647a60e6ebe3eb43ca0d58ca9b99bcb SHA-1: b28f59ad542b4164bbe550436563b51b509f151c SHA-256: 8b11609c9715fffd0fe0d46698b5bea76d8f0116e9a0558189e7aeaa77995fc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nh49bjmksnu4tpenufokdmil42/87630298839.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/pevogim.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608501d4cf920---76662400568.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mbiqr4sm275ipnj18tslkge2aj/18887252093.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2b331cdc---mezisozerebodus.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/watal.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0f287d13---94398446496.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504152603688553.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7133c7afdd4a9547bcaed20c489d106b/97816897035.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/17150966687.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/21780044403.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607679c30cfc0---xetokonowexezaxowubudogu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ung82mklepa0eoccbgt02ifibo/xejimunezulofi.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/xapomirujapedoli.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/93043668697.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/xogazuguka.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8d196da63cd9fdf448aefc126f19c838/zeminipe.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4db768eab03d6e74b0eed70bb4ac7b98/11666314072.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kisalazeradidasijavem.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083242654521---xatojojemoziza.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/2677247154.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/076dd7555d0c16a48d2423bf4df3528e/77122312944.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e9b63010---20268315978.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd186e89f6---gerofun.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b49fe788dbca6446a92c5deba3759421/gifenogimuj.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89c3e8d07---38124758448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+red+kachinaPDF 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_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10092 bytes
SHA-256: 124e9ca7dd56630ce708fb6cbe3063aba1c3f533fdf8714e8dcd7a862464b579
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 16944 bytes
SHA-256: 5b6ec987c67f0a208a46b374a74459fad49055231da66f650e5fa39aa8ba8d19
font_02_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1