Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a9efe1236bd50f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 02:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb32d9b3dc1bc78569a6e908c108927a SHA-1: 2431285f1563b84740d8ddabc805f9f89ae2acd1 SHA-256: 37a9efe1236bd50f83cde419b8cec6a893a84e5a8c8edbd38049143fa0a7d480
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. 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 document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=going+balls+game+apk+download PDF link annotation
    • http://www.biosafety.biz/ckfinder/userfiles/files/59834234799.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/12914426070.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/19856324717.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/15121867580.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/82353337808.pdfIn PDF document text
    • http://wernitznigg.at/files/93703652783.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/10522945612.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141138c7b38e---53349957313.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16140699bd0054---82643251518.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/sofubik.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94d38718d---tojubezezalideladifafeko.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57673221103.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/natibazixofe.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/ruronafajotobisenixagemuz.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/tizile.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/53652377860.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/gibaf.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/16372901370.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/67187693515.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/91582735113.pdfIn PDF document text
    • http://giga.sk/storage/file/gapaz.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/36526820760.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/wutajaxitoxusof.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf739400a3---jejonenimagi.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_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 10892 bytes
SHA-256: 39a539d4c7c693d87383d34cfe1a2ffd3f16c8b74821810b3c786f211d7b6abc
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 17776 bytes
SHA-256: 268813e11a93fefb48f74d8cd78db87f07640478b029d170554f1c8dce407f6c
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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