Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e2c45aabb57604…

MALICIOUS

PDF

84.6 KB Created: 2021-07-10 14:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0dbc0275b1381a1f92dc7c890f9415a0 SHA-1: 89fc32e78c0b70e71f4f0a05e1c38917cb8db85b SHA-256: e5e2c45aabb576046e853819bdb37ec872640c3905f1aa4070881127aae8bc4d
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 contains numerous URLs structured as a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=unity+in+diversity+essay+in+english PDF link annotation
    • http://architettoangeli.it/userfiles/files/31228250655.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/7711824061.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9729278ef0---3945389982.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bowonefavironadabofagoz.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7llqrcc4462t61h9cbtl5gvlmi/mamiboxariburasisufekugor.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/56858738156.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098606142512---tafosigunid.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c6cfe869fa13991fce2323b99cc92fe4/merazosoxujumuj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b95867bcd15---mugameko.pdfIn PDF document text
    • http://citra.cl/userfiles/file/salitofumokesevabexozo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/43165913903.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9bf9f9c2---91772047941.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/gumeposogitobedofeseruxa.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/supukewugunamawerixide.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2258b3b20f---vazutixinibemizumiruniz.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/37980846045.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e309bbc01---9930469362.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8c8d5b6f---nutunedis.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea72338fff71ac5dfd345773deecc22e/40643227268.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8034d9da518cb944a7abe967b010b7c5/95747194665.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/38065661071.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210603092555585962.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/45814a53ca91f415d35406dfbad6bdb7/47577032630.pdfIn PDF document text
    • http://haki.vn/uploads/files/dozedaxizeriv.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 15920 bytes
SHA-256: 3c9d6f67d4b540852528d38cead723d0d8fbbe70f23d71c6737ec208458d63f2
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 10596 bytes
SHA-256: 0732b5afc4f24f2d4740b4fa2fe7f1f2466a3e91aba1d71541d2d16b334fabba
font_02_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1