Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbb18c568e07ce0…

MALICIOUS

PDF

147.1 KB Created: 2021-07-25 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b82ea5e2ec6e4a6b1d5935868937a96d SHA-1: 0bdc1a40a1d44f208b78add13a859aec67b6d2fa SHA-256: 5bbb18c568e07ce09de6df6b89f04b9aa3b35ffcea1df7f7920bd7d3eda047e6
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 sites and other disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b943e5dabd---porafetuxaxiw.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92966b596a---80666143154.pdfIn PDF document text
    • http://riceart.ir/basefile/files/nuweradexaferigop.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbdf0a68c---xifegijupibigewir.pdfIn PDF document text
    • http://yuha.be/_files/file/warevevane.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/e2rjj2uvheigjb8g54a70lbm62/rovufafezepu.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/fuzukiniladikuv.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070103d32c07---waduluxezifuvimo.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/romogadenedubopiwogej.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d5413739d044f36b4ef8caa7a729cdcf/53392819217.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c842a75b5---nuginubuw.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/91021548471.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/pivonano.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0af30d151---83052346999.pdfIn PDF document text
    • http://homeopathyhk.com/files/56814637349.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/sesexufafokakufepagorik.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/70086280669.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/47138193862.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/japegasunezotapejibetuzis.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9e4438ec---56429478692.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e5008374f7e4da13aaf5c3ccec17a777/vobekur.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/19743757264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mec%C3%A1nica+vectorial+para+ingenieros+est%C3%A1tica+10ma+edicion+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB9C 11376 bytes
SHA-256: 78c099d4cb7583e391f2c5b996b01b376de0341dd3b21a8128ddea42094540df
font_01_sfnt_off0001d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5DB 20876 bytes
SHA-256: 6e602305305135279b46da4fce9e034d90e201454bfce1aae3ab07935e5626bc
font_02_sfnt_off00020c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000224a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224A3 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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