Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9a62c766822360…

MALICIOUS

PDF

85.7 KB Created: 2021-08-12 17:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7b1e9494d26c043d8108de774cd083b SHA-1: 6f0561f1ba4965192ec431fae50ec3f303f62213 SHA-256: 3b9a62c766822360bc5cd7ae0267c52cff8d60fc722960eef5bfecff8c1544ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://clinical-pain.com/pds/userfiles/files/funobilutuxumugufosupes.pdf In PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/joniliju.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/33205120677.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/ninopalekesexovaj.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/rovinupafomajabejegeka.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d41d335aa---61920521859.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/46182531609.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8e5974c7---17356120273.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fixizewiratodudirelutul.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/39892893618.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160add32d83226---sometefapana.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107180258237680.pdfIn PDF document text
    • http://cartolmania.it/file/lovajusekewitof.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/getokozawonanovogujin.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kadisigamafim.pdfIn PDF document text
    • http://tw-go.org/files/1323108514.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/91860839737.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/44723735431.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/vixejazefijarurixufak.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4d31b71e58ff84543615b480ff7c9e/17761314329.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/lagivewegizoduxupigimu.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/18a982f99b22bed042e5ca3efe80665f/68947235665.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/dewitejuxotomagojun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=why+is+my+dyson+head+not+spinningPDF 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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 16544 bytes
SHA-256: 4d437b315421b3135dfcca4e0774f3c7eb5e1fd5e411b8ffc82ac2cfb7768242
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10800 bytes
SHA-256: 19984744cfb60674513a73db21cecdab8b8dbfa1ddcd9abf77030b345d818508
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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