Malicious PDF — malware analysis report

Static analysis result for SHA-256 303ed378f1d24a0f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ae251fe5772e9c9bdb593bde2f66a09 SHA-1: 417c0b576129492fd3255693442d82bf1b101165 SHA-256: 303ed378f1d24a0f197ab55c937835ab612222ed98afc3953cc4edac5bfe4ff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised websites or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term=policy+cancellation+letter+pdf' in one URL strongly indicates a pretext for users to click, likely leading to further malicious content or credential harvesting. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=policy+cancellation+letter+pdf PDF link annotation
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jofakok.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/posufebidowegu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e8629a13---94244154110.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0649ca0368b2e7c79cf5576ba24f2a39/raluvowoj.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/vodififelotoxamejewosi.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/maluratamotumalakaxutik.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/76764123314.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc505917de---kemobafe.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/gofubuwevi.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/woluze.pdfIn PDF document text
    • https://hse.tw/upload/file/gupoduragakivinixaw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/trncg73k9f7b6h0uve5uppk2ea/53420267001.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2032d350c3---56445062169.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/lekukenuxux.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/29784870802.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/likadin.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/wakokovalirefurizo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tumisimumowan.pdfIn PDF document text
    • http://ymmicro.com/files/files/mifedupuzaxeruxakukoweta.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d0v0a1k95do72ddvhtcmrrl137/momutogoxif.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/werol.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/15530130278.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/12278365317.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2d94133a3924186e7ee5ff617168099d/68149437449.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/relilijovakuvajorizonibi.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 10560 bytes
SHA-256: 0ba27bb37d9a9d82fe6d4a176a8fd87274957d0712e42949f736692f4916da4b
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 17232 bytes
SHA-256: 527c7b5e7b5d724ca1433f2ab212432a1c94712b8844084512817fc720240650