Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88e0d8cc5544ee7…

MALICIOUS

PDF

103.5 KB Created: 2021-07-02 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 828e6e38a954cee3d4462d9460608ef6 SHA-1: 80be084eebea9de586f8aa704ab61c740f3c02fd SHA-256: b88e0d8cc5544ee7052153889cd9359a92bbfde1a8d5553497a36e28e65396c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://aarogyamedico.com/userfiles/file/20372991707.pdf
    • http://robalton.es/Albums/images/file///60204202033.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe3e3078b---dexamexe.pdf
    • http://www.anjhimayath.com/upload/file/pogefipaxowe.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/783180cc7b80a3bbf8306b01251fb853/29681156974.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pipipumixifelirakofef.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e6a6097---lipoduxojamewurapabatitip.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7a6f959c14ff77e8a5819731d69074e0/fuzijogaxe.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be04159e25---vixezevizegesirubaga.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecdc323bd---87961277353.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fd678868bd9ea32031467717282af0a3/lojonixuf.pdf
    • http://busankid.com/webfiles/board/file///ladifo.pdf
    • http://birnagarcollege.in/userfiles/file/xilifubugodo.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l9edbs8g9jomhbmnm76du4qimr/76419530245.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7942518668---fiwofimunobikesoro.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ad5f10fd2c8f80b6eef2bb348180b839/44822754873.pdf
    • http://yachtandgulet.com/userfiles/file/legugovigoxoju.pdf
    • https://mangmalungtea.com/userfiles/file/kabumavopoxezozapapivuwa.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/pometidotavamoripixe.pdf
    • http://voijin.com/userfiles/files/51144888852.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4bf777c4ca0c69a1c4d4dde0621bd6ec/tatenagefelapifigugapas.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b1e6aa10e43cb076dec257551827d763/tebizemiziwegom.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/rudibobikunopot.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091634c091c8---55205927462.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hot+button+issues
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010169.bin
4812470ace7390c2107e669dd7f3a39210fe51eacb6e773077971ee34849f398
pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 3528 bytes
font_01_sfnt_off00010f76.bin
bf6812f461e9d70f23e6b8fcbc46d5f5c836bbde58e18b0ef658ca329063280f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 23700 bytes
font_02_sfnt_off00014a3d.bin
9974b844a693cd505087b8b36ad981af6b21b903f2210b421801734f61670f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 10024 bytes
font_03_sfnt_off0001609a.bin
f702c6d8ede6a3c12d39f059b22f2079633168a770d17852961fda398b6a4e14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1609A 16604 bytes
font_04_sfnt_off000177f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177F8 16792 bytes