Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b60f70e32da584…

MALICIOUS

PDF

95.8 KB Created: 2021-06-09 09:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fa3f0dd1b8ab6cf0ef0a876555591363 SHA-1: cceaf05b99594a75aaf52368e2cfedc071888c62 SHA-256: a8b60f70e32da5847543331f4fba84e4cf02572c7f4fb2fb2bc1f19f13d4dbb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a lure of a "mystery gift code" to entice users to click on embedded links. The links predominantly point to compromised WordPress upload directories and other disposable hosting, forming a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=mystery+gift+code+for+pokemon+home PDF link annotation
    • https://kildevangen.dk/files/nijuwilorefazuvadelek.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075344b364e3---91893418723.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b6f149d6---sawuxerur.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e059569f2e---15141926508.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2daacc980e0313d8940cf296341a1389/mizuwizakoliwonumuze.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/bevilofejekadafijawesopir.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19401065801.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825907ecb31---53084242744.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4359523bba---tagaxabe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/arb02t9i7q6277qtbs3e6s3t30/94743662125.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8ffeebd1a32d1bb5ebf77c9da447ae09/4600523014.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8303d1259a---fuwibuxotaxoto.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dozifuxivox.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/55f0b96a6c8df5b02ba7a9c1c4e0046f/degejudibixuxizi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/js2e9r3bm5qebcfk0ajhbjs5j0/kexevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10348 bytes
SHA-256: f587fd6924625f60f341a5cf33536fab85506971886d0f213b2ddfeaf63af7bf
font_01_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 5496 bytes
SHA-256: 6e2a4994d0cb94f7ffc03b038ca7f472d41efdd154943c17bc3de61e1ca5f3a9
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 11412 bytes
SHA-256: 85ec35f5ff7bbc7b74cf2f7d8e69e62aca99071409b5a7c89e238085bfc892ab
font_03_sfnt_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 16312 bytes
SHA-256: 960e07536fde2f8e5443eaed0c0b4b010fc9b64327965bce288648b0e9674375

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