Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f7ca3226b4866d…

MALICIOUS

PDF

212.5 KB Created: 2021-06-19 09:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e439e176cb0fb9116a95f50aa9f96ae8 SHA-1: 2d329cb7450f6e94fecfb0cead45ade10b515613 SHA-256: 87f7ca3226b4866d9c6938541551479d51cf0e92877046d1c2d274e9736ca6db
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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=surah+mulk+online+pdf PDF link annotation
    • http://jedwines.com/cmsCart//upload/file/vutezazativafiwuxidisi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a94d57ec---xugivukixunen.pdfIn PDF document text
    • https://argumentua.com/i/file/45131972055.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a114d2a1---21897664261.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/17464293334.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kikapev.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/b53ae4cae934d834c9904fb03bcec2f3/78106175713.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d25ec0a77---litigafixita.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/35b686649cd1ec0cbcaf3ae3b662b8b4/96456342679.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b2e2656e---gosuwupolizer.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/42293433106.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/437aab824cdd836f0d8626dea413d5ab/sopawirazubitu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ce2c09ba37e47ed6b62274ed172f2cba/17415731984.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb8b95579---tozufariwaje.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b93debea8---89423894432.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/v76remr0nttotdl5gogbgv6l00/disazodimoribifumaselomuv.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00030976.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30976 33496 bytes
SHA-256: 64c5be275b60c4a7364701eab7b3985083b06f0d72e3b229283ff77e66d368b1
font_00_sfnt_off0002c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C95A 1636 bytes
SHA-256: 0814669f9937d269bf254e7551be8a05198d8b72656e1a35a3041fdb5356f41b
font_01_sfnt_off0002d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D199 5268 bytes
SHA-256: 259c7635ce3042b7751174f915cffa5251f1d050a045a73b0678d29ca62555d9
font_02_sfnt_off0002e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E357 11116 bytes
SHA-256: 6254c9472dd5fdbd38c0752f4b71af3fe6d5d7195a2f3af04fccc107272355bb