Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba5aa493996a502…

MALICIOUS

PDF

99.0 KB Created: 2021-09-03 17:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 424825d7d3dde08c38c06801f4225bcb SHA-1: 63c7e8722909a9a117ca56b9fe23135016ba6b08 SHA-256: 7ba5aa493996a502548f04d2685b262f393ec49a812b657c1db3453d94edf5a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vitalenzyme.com/uploads/fckupload/file/92189230333.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160921df9504fd---fufapelumogukoxodotafo.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/bupizewuwuzarerif.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078335359230---bupijifaji.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nirewezosexuke.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/38722149539.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/73755894851.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/e5q1gkbnr166v77genv2m0j9q5/xupewatizap.pdfIn PDF document text
    • https://sy-tech.eu/file/32549359405.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/difevagofuzovexinupu.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/38091318519.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/69867546275.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdf6cbd259---puwaxijotewiretarojerapu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070325d62477---83533719893.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/24042351317.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4cb645f90b03dc215ca4b0091f321eab/wugakeworoxofelon.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/32069536740.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c452772061955caed8e048156b574079/sanatatasexejatofi.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/goriludejomumovexetilav.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/sasurevexi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3c54464999c3b1a790788f7f2e68e309/tabufuwoxufixifi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3fed52161a81943d305a62fda3ac2e3f/15244266747.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/43636670985.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716c57a9fa---9246085156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=codex+chaos+space+marines+8th+edition+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 19080 bytes
SHA-256: 55f863305cad564476787d5267a701b10b4fe26cb7a59f7b4bf03d008d111e62
font_01_sfnt_off00014bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E1 11180 bytes
SHA-256: 3b69c41be044c90c202f98d7dcba3492a6a82af937651d4c2ce6d6100f5a5b86