Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d5e53e15323727…

MALICIOUS

PDF

90.3 KB Created: 2021-08-22 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8db7d9c0f5488af09608a2cc0f248595 SHA-1: b8a9a819e9bbf2f247d8da990ac731df9159de00 SHA-256: 81d5e53e15323727fd451ea38376abb19c537bd5b31aede4b42459f0eba3a8f4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine rankings or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://azizolace.cz/images/file/rowunufagesefetaluwe.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f74ee1e7---52509549297.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0lcp17f99n7u6718qbqquqih82/tefaroluwikuromadimitax.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/xafabuvumuturiperabefodak.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/76755022153.pdfIn PDF document text
    • https://ienter.bg/files/70154776138.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/29f2861811a31d08221bf5d6a609e41c/paxezasiz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/05450adb7bb4185296afe795d79cb403/95079937372.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/10786598048.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/finupidinowobokadujupijam.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/loxaxez.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161108b2ddfdeb---pemuve.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf2029425---93662914973.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/nefomedupadapufijebenem.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/29316231915.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sinuvuvubekujifunosine.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/85aa18d744bc848612e95ff9701a6f60/1768988936.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/zebiwijafafeb.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/59162111288.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riviwuxogojovavabir.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/gaxonubajugubezetajel.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1289c474ec---wiresikelininujulevebolup.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d45fb6255---fijaguxuren.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4caecc27---89626863917.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/77674899679.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/64583541482.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72d3011f8---roguvadekapexerisobazagek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+libros+de+cocina+espa%C3%B1ola+gratis+pdfPDF 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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 17956 bytes
SHA-256: 8172419b3d15001bb6a6fbf681cd5aacd2d7fada7bfcb3f01a44cb61d62f7595
font_01_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 11140 bytes
SHA-256: 9efefe1b7f1fdc7c46461a62f7053ad760d6a60f5a84fca01f42ed02a6a60dc1
font_02_sfnt_off00013fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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