Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb46d5f6823718d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-08 07:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99952a0a28741eefe6620236b66510a6 SHA-1: 15fd59607c8520eb359d796e37719a8eb90e6764 SHA-256: 9eb46d5f6823718d55a84f7a35f93a22e11fbfac979e994dc8e1eb6487dac461
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm on disposable hosting and compromised CMS upload storage points to a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://engineersclasses4competition.com/files/others/laratejab.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd43bf5644e---pokevodituruzisisuxapoto.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b58404c0211---dusulujupu.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mogarajusigiliwis.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16107402607c2f---76081807733.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b576888c42---futotivajibedekajokutefij.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bcb7b095---22954278268.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/56084118100.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/poxaxi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2b7c77ed---wozipekexego.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///gawunuzux.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bg4a6ocjtg6gem402tq5isgesc/boxub.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d354995be0---73574341982.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160731e9c79f18---34502091621.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/lerotakivonaz.pdfIn PDF document text
    • http://artospace.com/pics/file/8727397529.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fc8ae6c8d4e1b4d13df3946776762326/37860377955.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/4976082514.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/41652763071.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/87486019281.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ae8652e6cb71676c1ef54377a2cea8ca/jeranezewum.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbd6e62219---32306049019.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/bofudavoz.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/47690940745.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/33674847817.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/falotarawudopenokofijawom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=6+inch+ruler+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 10340 bytes
SHA-256: 5844818a5af662d945cae6c2b439a4e5405a594b0cba8ad894e44b95c77e9407
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 17640 bytes
SHA-256: a3319598d84359396861a2dd757b686ea17cdb8f719a38229fcf1d549d99c4c4
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 17288 bytes
SHA-256: 43fe1d5b1b7913a62c8d6e3f678a6f4cc6b5cf883c34b5d18c38aace49d50e15

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