Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e2091f28f3b7a8…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 05:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66a61bcf64975ef26ada17859750f539 SHA-1: 531ceb5ee5d30ac7e49bab260e4068c6446f1b3f SHA-256: 10e2091f28f3b7a8831d2563818555e64fb6f3281e32a523bc1af86e841ca280
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://perilatomsk.ru/ckfinder/userfiles/files/74624589108.pdf In PDF document text
    • https://arhometutor.com/userfiles/file/2193850799.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b5583539---22277569066.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44460144963.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/69841170523.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/bupoluvak.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/besasumopotasezelamu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/lonivitowumuti.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xijozudatajukuso.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7vot4l9ke28a4s1br1srkun6g2/63981835862.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/51942069258.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/45298906444.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/jogomugavivava.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/10821851366.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/xujudubaxatalijogit.pdfIn PDF document text
    • https://renetravel.ro/images/files/77777326981.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/segupixisapuvifijovu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc9edbeff---84834479769.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/gafovegenirizokimidonorul.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427bf5853bc---rugisodelapexigu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xototetotaxajezeveram.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/68872598965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+sync+icloud+contacts+with+android+phonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 18264 bytes
SHA-256: fb2de2b9fe4b8b5124e816f949ac63bbaa8b4fb63a3c8ea16e393a99b630fb53
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10900 bytes
SHA-256: 2101851bf83d80a47e88f56360fd7324c9cc3bf124c164c0a6fc8735b028e6a0

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