Malicious PDF — malware analysis report

Static analysis result for SHA-256 c410b7af141798be…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 10:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08f8df3c6049f0199fb8305d3bbecfd4 SHA-1: e49155cbeeea48a9dbb88ee0f65c402bcc6024cb SHA-256: c410b7af141798be056ad3604b93867b81730e06d64f72e87c20938a8665e0fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure, with minimal text and a focus on clickable links, supports the conclusion that it is designed to trick users into visiting attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=ios+vs+android+development+future PDF link annotation
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/69379168097.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210919050648.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/87656541235.pdfIn PDF document text
    • http://8-hi.dataroom.tw/upload/file/37194838319.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/76338435423.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/35f1c6dde6ff0d2cd6b79a0b448a5953/14252816597.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142d315b9579---3955446735.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130696dc2e53---zenibuxosivanosoxidatojat.pdfIn PDF document text
    • http://flirdining.com/uploads/files/2808753494.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/4400330942.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/53522012502.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/56674289837.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d8c642ea68eade187533ee844ce60e0c/wulenakoxixewazokuz.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/88071796326.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/miguwibenejoku.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/xijusujapoxosizenikumuve.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/ridezeja.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0c59dfb8e211ef1b03ce38cc8d6bbaf5/nigem.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/dofer.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/46290430096.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/83398150817.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/3207594162.pdfIn PDF document text
    • http://protezas.lt/i/File/bolusotivanakupiz.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/4701772818.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/lobot.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/51849042019.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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 10776 bytes
SHA-256: 16e0fd5dcc8db8438b88b1a0971dc78506d5b6560e8888aec5b76071c4c9fc5e
font_01_sfnt_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 14460 bytes
SHA-256: af3dc5c99df3f31480ec8fada17e63308a98adeae99fdd9f6ec77d78ce03a44a
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1