Malicious PDF — malware analysis report

Static analysis result for SHA-256 a460f99ef9452661…

MALICIOUS

PDF

76.2 KB Created: 2021-09-28 22:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac5a0f0dd03d569e45f5e8f81a6acf6c SHA-1: b7d41674a1ff44feb201e8eea431e5d78193aff9 SHA-256: a460f99ef9452661df1d4430e6db38838f8bf324d32c58244a5cc9b9a4e50083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://aotwresort.info/ckfinder/userfiles/files/zijudode.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e7cba94174c306e51e614e54062268e7/nujoxisojepe.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a9dc94a196fedc23b0df42066b8316c1/rajojotukurotogozeje.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mudekigagawifijilar.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/gulofinimuboxonisemakopas.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631020147.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/94354541575.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406f984c1b4---72648456910.pdfIn PDF document text
    • http://batdongsandautieng.com/upload/ck/files/53539364343.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/zuwekiwonaw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sewawejibege.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/31798542401.pdfIn PDF document text
    • http://gestioniarmatoriali.it/75477096005.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/39655401365.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/gobibegalup.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/9988403856.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/57513815828.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/97176610458.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/dirorari.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/totepusovizukevija.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e314db4609---93813311081.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/81554689894.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/viroseno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=no+fear+shakespeare+tempest+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71A 17812 bytes
SHA-256: 2e2caf82e53ed8fb38e83b245d357e8b9bda716c0ca54b37e2f4e9bdd96e5f2c
font_02_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 15932 bytes
SHA-256: 947c08b3a9721b2c728aa0644acc57e094b4c42ddf67ddfb600f2ab01af7279b
font_03_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10588 bytes
SHA-256: fc9d708920bacc0a4b7af0566767c20f0cf30ad2f6f3cecebcbe38aa64d7af95

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