Malicious PDF — malware analysis report

Static analysis result for SHA-256 8296caef3446e236…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 01:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 933c644df3823d37b2017afb0d69a4fe SHA-1: c9bec169b3eb93c7b1bc593f84a007b5b104d677 SHA-256: 8296caef3446e236b1197f147bbcf699843e80c63ca4419245acd614d03de8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, possibly leveraging PDF vulnerabilities or social engineering to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=the+cross+product+of+two+unit+vectors+is+a+unit+vector PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073667cdebb2---17007236728.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gumukavosumofum.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9s54q6m7d59lhcvctp6m9i4qc4/lamazodutite.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/033600a82f72a303190cb0f72238fe63/79406173654.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5291h0irolvuv7tmbsk5ce95jh/17929331944.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d1namcjfh86mn8p96t22eci224/wusuvamu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h522c095gqa4bot165lii1muv5/71889627022.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8cf889fa1---79817337868.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/49823548094.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/sipolefotukemawanupojuno.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bijuxejixipibipofejem.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/83d46kg4lon7l20l64t17ucg1q/natamuko.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xumewaxog.pdfIn PDF document text
    • https://tpk-m.ru/files/file/nesadukinajatidawi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f98a30846---raridafuloxo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/29935935118.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/2986746300.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mqomcrj2utm4378gfvvng8thlt/84753843922.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/23725998367.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/92200702502.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/55580291793.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49139064600.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0866e64f0---76591227870.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/bagasuka.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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 10884 bytes
SHA-256: b758820a7d7772588616418d3011de1a2a5f09f63bbe51f0aa551dfe05042f48
font_02_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 18144 bytes
SHA-256: 90f767ba55a2271a4d237bbfe725ecca0660763a4b8297a02828044bdb04c5f1

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