Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac51ee6d05cf833…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 14:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9576aef2826f3d143cd8076c575649d SHA-1: f4894834d956b87167d19883b32bccd70e501973 SHA-256: aac51ee6d05cf833a492c9e4b4df653b1f2a566a3a891fa6ab24b38da59e1c4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially compromised websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=al+waqiah+full+pdf PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/wigepobuxezukavo.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/67936487725.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9286338ba5---5095588515.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hovsnlf9qa76hql4m1kp4o5n6g/58210819802.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb867aee08---gunazabe.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/duwipoduxalemesejitaw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93b474eea---womaza.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/93805540977.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/71464336472.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/istlb2iogievvqmgvtj7ohulf5/47595961624.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/fedefijixop.pdfIn PDF document text
    • http://ruresept.ru/files/file/vuvukomeboponikolabetuv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084342004bc7---dokatifeli.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/20108275161.pdfIn PDF document text
    • https://daismene.it/file/19067060805.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/33629265147.pdfIn PDF document text
    • https://akvaguru.hu/user/file/vekejad.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qu5c5cmqgibuo9qd8i7lld1i27/murepevoviropo.pdfIn PDF document text
    • http://cssh.es/img/file/dabuwaxedowugejosi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/60887813183.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7goqiqjnts8adhdgaubrusm6fk/tegomijatebol.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc32e9a141---98926227784.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/67202218221.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/63029468958.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595fd29a09---35863511165.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 17308 bytes
SHA-256: 9bd3a3b4aded9d9cc573b5cb23540102966e1189a2ac5a2c2d11e5f8ff4b20d1
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10184 bytes
SHA-256: 47adbe81c7ba3f75119a6034d5640152f40a4aed10381bff794f834133ee7652

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