Malicious PDF — malware analysis report

Static analysis result for SHA-256 513a4b7c6214b883…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 07:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4453a72a8b0cb56c3732bf8bb6a0e71a SHA-1: fb654eec56bb327f250a9a11a7debad94dda1b3a SHA-256: 513a4b7c6214b883db25d9ab487f805d5c2416a549c6bc08212d12f49fe4eeb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. These URLs likely serve as a link farm to redirect users to malicious or phishing content, consistent with a phishing attack pattern. No scripts were extracted, but the structure suggests a potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c5c8f9d6---sewug.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/52f3371d20d4546adb0651b48cf0e0ba/xaliruge.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/6eca75c1513164fe3f7abebb104cb065/salexikizuzati.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d647a545f4b87ada7a996d4f82ba5fe3/11887586765.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126dea8866a2---96060941738.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021072923182424.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044ff3b04d8---wozezuniboke.pdfIn PDF document text
    • https://fultoys.com/userfiles/fataxivunirakakajotegadol.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210705_87E05083D241BB32.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6b03ea7af---37624999677.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/povoxirejelu.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/97422439897.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/58754335177.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bafuwebusinowotajavotok.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/56420227094.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/64491190573.pdfIn PDF document text
    • https://xigmatek.com/upload/files/buramibosojipid.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/15iqb22opdk8gfcolskmo2g6j7/gozezeri.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jiuqv6lb1rrqv5sd81fickjes3/41386964078.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/2942560053.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/76816448526.pdfIn PDF document text
    • http://chinalabware.ru/d/files/36940963597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oop+java+concepts+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 17316 bytes
SHA-256: b2ee6f6849b24fbfe833aea8d52a5190dd71b03ec77abc17c548978625567c96
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10596 bytes
SHA-256: 845ee591888710e20e383a61eaa82bf2cfe44fd30877d8c603943ad44b85a754
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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