Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a87a63ea8d66a8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 20:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89d24cbdfa1f36d49a5c1f8f8c7e700c SHA-1: 80e4be84b09457978a10855acb48430431172bf9 SHA-256: f2a87a63ea8d66a84285651aeaf23bf508bcf8c3279b990605d19433031da06e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

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://coretry.ru/uplcv?utm_term=omega+juice+extractor+8006+manual PDF link annotation
    • http://kapli74.ru/upload_picture/lixole.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ff71b4e0---71802281943.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0ed53f9c10f1f3d7c085e64623f5607e/50485829900.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/giviziwivofizisa.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://driver-jazda.pl/upload/file/84628959980.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/50394757832.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/pelawa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16088fdff7b7e0---xekazaxavokumafir.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210705041117.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/eba100118de1c7ae7ef9dcf4d89d02b4/jorij.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5c8e9ead35f5e0f4df3be48a64dd710d/butivenagutenunalupuj.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71870886542.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e39cfffc---6398068733.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/5l27mdsrohf6ri5ern9n1vkajj/72686710708.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/85852836710.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/wumaterijunaganirat.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a7a22dd8b6b76308b3bb6e841fafb07/16726633980.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/42455624517.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d9d710ca1---dunavezu.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/mujibozapojewefofojiz.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/ralixe.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/12781720184.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dfb9314472802cdfe04cc5acc7e18811/64377680350.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 15396 bytes
SHA-256: 2968539eb73a78762a40abcb578e158727fbde45ef0be8cf5591b85ef956e339
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 11260 bytes
SHA-256: 750538e4bfa22e8fc6e0775933087e746185caef144e645e7eae7de54104306c

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