Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa42690fa9333d57…

MALICIOUS

PDF

89.7 KB Created: 2021-07-23 05:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c288e85f10a5f6ca08188b1144c2f58f SHA-1: 85e8bed2e5f0a10afe5f59447cad7355f403558a SHA-256: aa42690fa9333d575ddaa0884a30a74584a9fee10d41de8d9c8b4285cbebc647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lure users into clicking malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seoulmenu.com/uploads/files/12295509470.pdf In PDF document text
    • https://tasleemdubai.com/userfiles/files/71195906066.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c670fa0ebf2---puferajokudev.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e48ce0cd958b452cf311750cce8f6586/lowaxufafinowo.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/dopubivenifona.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/pewepifexabufogoxajokekub.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6bc9ad83---28448114854.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebebb82abc---21017440652.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kenigidunakegadukatuxifu.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/zubobumujopaviluxuma.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/61595967007.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/27f6a384deafb6dc3cabf447b81efb2b/tabujadubafepo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e3e5fc25028e753cc29f07e1c3cde581/zarubavi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/62eb67057b52613313fdc7cdb3c61e45/5804108525.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/vuverajukot.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/111b1d61d7bab819e16dc03b3f471416/97039440744.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160830afcc1e0d---xapedorosemexifafadefexar.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f45668f62590f8b482273c0728ee9d67/1148277845.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772e2892f6f---jabogedoxuzobo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/50854638764.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd41b2544f---85403375520.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b3f07e12---bifofegapaxelikanad.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3q851t4o4t4jlq6snbr2f9t27t/superasetosovifekafaxop.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/29580861975.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/88108491799.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96898297036.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f19440c15a2c68946090df6535172e00/71140435806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blackberry+cobbler+with+cake+mix+and+spritePDF 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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 11368 bytes
SHA-256: db6bf09c3713c365eb6db6872a46bd53be30149b91a426e54ed79738bd0ef4dd
font_01_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 17636 bytes
SHA-256: 891fef07698ed1d3f5e940231a4f4368088d7e4b0a2c590f2dee3330ed262f33

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