Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b0e4f9c0426338…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 20:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9360d910ba414fb5b552c39a6509ac3b SHA-1: d0ff8b953942d5f6383d457ae3d8ca3c9b438326 SHA-256: 28b0e4f9c0426338d4f4e5678a6be9caa29f7c735422bf723891016b348a54ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary intent appears to be SEO manipulation or directing users to malicious content.

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 http://leaguengn.com/userfiles/file///27806347186.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/80714322447.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc1590eac---juwedubigosepopuxosa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lgshntq5m6boh07m6dg5jrjch/42926411204.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/36540048095.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93312db987---wivuralepu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tuiulv1cjnuqvnkusl3q5bknc1/3073109533.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5qqffk5qlqpcfh3ska60t1h3mf/150276706.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/pisoruzoxomojemududenil.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/sonawenusuwonudivavi.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/28141701940.pdfIn PDF document text
    • https://advik.net/userfiles/file/2210366898.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/kejuji.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c7970b79c2a---72076254975.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1124f6c684---16492208044.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/420336e9fafb020150a46c49dd993cdf/93879496483.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s0dp168cj9gtkcqhqgs6hm35t2/derisexezo.pdfIn PDF document text
    • https://uudanbury.life/files/file/48701079416.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/pinenip.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/22558379928.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/36820447087.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079facf477c7---zutifexapifusebuzima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=banting+food+list+pdf+downloadPDF 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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10580 bytes
SHA-256: 9eac6bbdc5847df4c3bd7dacb3a530db5597028867172ba48752b1e117956361
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 22208 bytes
SHA-256: 0218aa74b62b01b0463b982953245c7c7a07ca1ac739c29540cb3d7e8a760a13
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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