Malicious PDF — malware analysis report

Static analysis result for SHA-256 1005f9255f6abadc…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 09:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef6d4bc2431935244320c824eadd095b SHA-1: 256ef31bd01458fe8a95cf728ac939b51de3b5ad SHA-256: 1005f9255f6abadcc19f1af72cde235094d00ddd02d1c56915e4de7e0abf038a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://oniceh.ru/uplcv?utm_term=telegram+movie+app+for+pc PDF link annotation
    • http://baigeleather.com/userfiles/file/70834983140.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631324944.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/81606973284.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/42688326524.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/85173428063.pdfIn PDF document text
    • https://petala.gr/userfiles/file/31164491676.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/35962965163.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jakikukewurununoko.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/keduzunazezabixasofi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac70a75154---vagoxudomanazemomab.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2de2a140---pobobuzuwebabuto.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/19590438595.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/88153199679.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98235467725.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141727e6d8d3---zeburakosuzebusi.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/dabirabizekaboxajivog.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/rosoxubokegazojiwamojemit.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mumizewufebeg.pdfIn PDF document text
    • http://onelove.cz/file/funekejosufofo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e308aae0---bikabarokerunom.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/pagavazulusizazij.pdfIn PDF document text
    • 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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10480 bytes
SHA-256: 768939ce49fc5c87443ca5da807c30ea06fa9033647fc144bbcc21155a147231
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 18452 bytes
SHA-256: 9d56b91664bf452bb73b529530a8b09a4aaa873e4e68040ed67a524093e65ec6
font_02_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1