Malicious PDF — malware analysis report

Static analysis result for SHA-256 e349daa41b9d4e18…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 00:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eb1652bebd4006d25d2afd450733b39 SHA-1: 2eed6205920e772161cbc57b90c310d9e58e84ef SHA-256: e349daa41b9d4e18fa517c4a111f1726235359f0d6b9acc1e5708dba317c4963
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to call a phone number, consistent with callback phishing or tech-support scams. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a malicious intent to deceive the user into initiating contact, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=instagram+photos+of+private+account PDF link annotation
    • https://music-group-store.com/upload/files/31409644426.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/405873284.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/56395382813.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/91332904869.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ed7fbb5a1---90961701638.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/jusamuremobimoxonokiguxi.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/42050173081.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/fiparegoriligazeramasale.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/915386d773fe392dea0d0ac2fe53f978/befagitujolevirave.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/90387022230.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/71699917484.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/31047459295.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/10243008655.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/duxopodomowokivetilu.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/26918959315.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/vujoroxu.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/ligeriwadabe.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-14/20210914070321728263.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/gigivur.pdfIn PDF document text
    • http://land89.com/ckupload/files/15908826866.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/zizabower.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/faguzuwuxub.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/052a35d1d18e718b3964456525c3aef3/baguzomodeb.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gexovarusege.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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 10996 bytes
SHA-256: 6bf97c5bfa9e3605adea4ce939007791f7fb7b4c2a68976b77e1a761fb5190ec
font_01_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 17996 bytes
SHA-256: e8fec0c7dd886717bbb75e88aba15b36e4ab5775d85888166237710d86997f4b
font_02_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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