Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6d464516eff089…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 09:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cd98be5ff95c23bea7ebb873a6a87b7 SHA-1: 94d7535fe447e70581949702618b35e52eca577d SHA-256: 4a6d464516eff0895398ebe5b5cc4862bda595ab0f6ace3be20999f188603e34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://thekreativecompany.com/uploaded_files/userfiles/files/lapolima.pdf
    • https://equator-maritime.com/userfiles/file/sogelebakibi.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/gudiresixijosaku.pdf
    • http://myphamlulanjina.com/upload/files/tejajomi.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/3609080472.pdf
    • http://mini-garden.ru/userfiles/file/10849257199.pdf
    • https://pr-dienst.ch/file/lukirojujabasimobop.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e949688d8e---22576462488.pdf
    • http://market-oborudovanie.ru/upload/file/mefigomuzetikexiridujuwi.pdf
    • http://tunecharts.com/userfiles/file/29114247540.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e147c0a913---purifivoreguninufuzulu.pdf
    • http://sreema.org/FCKeditor/file/mosikufudevuj.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/bilobu.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/25582487599.pdf
    • http://suamanhinhlcd.net/userfiles/file/zapedilezogifi.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n443vttvv3hjgaqu39ch6uq431/zoposanazekedopaketexune.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/danizu.pdf
    • http://monthclean.com/uploads/files/202109031021533554.pdf
    • http://energo-winstal.pl/userfiles/file/rawapide.pdf
    • https://hinaweb.com/upload/file/52655824667.pdf
    • http://makesomenoise.hu/upload/file/benawakedezesuro.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/19669472008.pdf
    • http://strap.sk/uploads/files/zovobupililugej.pdf
    • https://suativisamsungtaihanoi.net/upload/files/60502562768.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fodumisixaxi.pdf
    • https://detector-billetes.com/Imagenes/file/lapajonirogidoke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=putlocker+chamber+of+secrets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c27e.bin
fb70395c9a0304cc16940a701d46be84c1f3ec310c86441090e30badbd2c53c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 10736 bytes
font_01_sfnt_off0000db41.bin
53368a7ccc975b2333f5e213660413f11c2ed3afa3b92f771fbb3d0282f44372
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17216 bytes
font_02_sfnt_off000107f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes