Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3014356f7d24b61…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 04:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2439f6be1a73786447d0e638fcf31242 SHA-1: 3c344d7cef0056f20cb0ccb03cac91a445a6fc39 SHA-256: a3014356f7d24b61272419bfd5d93ac0c2a667781da40794b513d3e03826a8bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are designed as link farms pointing to potentially malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that some links lead to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://drafthe.ru/uplcv?utm_term=technical+analysis+for+beginners+pdf PDF link annotation
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51592480472.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3d80eefbc25800d8146457b1b228a1a/suwefe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/501604b037898f446f3c2a76b4a29ffb/fepapaliwinawarevi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m6imebdh9gmc761scnnc2clq96/264475063.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac9eb2b77---galuvifuwoliruxepetazo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf8f9cceb---72667294681.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/pakadejuze.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/102145803260902e5be09dd.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42d1fa0ffa040c7e72fb103209e6138f/wofepodujosijar.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bomelofesudebu.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/12892907088.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/31339803324.pdfIn PDF document text
    • https://tepihtrava.rs/files/nusulu.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29586153781.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/jagivifujuxonafuzaruxux.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/fozedegelij.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117567fa4221---mamudoxuru.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/befilaliwon.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/21364998346.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4g2sc9a5ue24lr9mcmmpl68566/70057995849.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/sosexifebi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/12053996549.pdfIn PDF document text
    • 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_off0000b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 11016 bytes
SHA-256: cdc37c0836975b0a9f75f4ceb6cd161958bd2315aed8e9c67105ba237279697a
font_02_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16280 bytes
SHA-256: b37a7d3703ee4ac2931bd87b759452e609c87621ea9f5d8a3623ea89a95bfc33