Malicious PDF — malware analysis report

Static analysis result for SHA-256 50355421f3980d9f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 09:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 021f1c196fcf3a5f1909c08d2eb9cc17 SHA-1: dae47c57a3e1a81b089682c3bd5fa695af676f62 SHA-256: 50355421f3980d9fe2ac5059ec13831b2846f80165c6101e2d2e4bfc2de89dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=harry+potter+sorcerer%27s+stone+book+pdf PDF link annotation
    • http://crocepadrekolbe.it/userfiles/files/wekuzozij.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417f0f4f3ea---69499616346.pdfIn PDF document text
    • http://letdentalab.com/img/files/33511165161.pdfIn PDF document text
    • https://seikai.jp/free_images/files/susevopevebejijiti.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tatuxuvatat.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/44510341582.pdfIn PDF document text
    • http://aven.su/userfiles/file/lojafikasafos.pdfIn PDF document text
    • https://citytrafik.nu/images/file/74949138802.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/15303200033.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff896015a4---fadaxedoboj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/jafan.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161411b5e87800---pivigevufumokusobisot.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/lubiwemulutikajefofojig.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910115510933.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf09d223a1---87420212075.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb15ba6c25---sepero.pdfIn PDF document text
    • https://sambelteri.com/contents/files/33711037716.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091217162173499.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/53429745015.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212c3934ced7bb7faca687a57dcf3eb4/65622493100.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21706603436.pdfIn PDF document text
    • http://rayer.cn/d/files/1250874721.pdfIn PDF document text
    • http://gestioniarmatoriali.it/39197533993.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_off0000bf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 17300 bytes
SHA-256: 2175b389ada7b855d14296535a9e92dd95f7023d503bee14825d93b893a9f9e0
font_02_sfnt_off000103f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10848 bytes
SHA-256: f76dba44d8f905b87f532298b82c65376a876a1d5d6f60fc67e297eec9ca54bd

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