Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6e7ac1c65c1e93…

MALICIOUS

PDF

75.7 KB Created: 2021-07-16 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98d22cdc3fb631631d6420cc171fee6a SHA-1: fc1a853a95d8694a81ebfdb971150f46b0dfeb62 SHA-256: cb6e7ac1c65c1e939b896507f1c41b495b36e2c8f90bf3d3fc1de59cf08b3530
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host and distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=used+srt8+for+sale+near+me PDF link annotation
    • http://sincaremedicaltour.com/js/upload/53389301549.pdfIn PDF document text
    • https://senfina.top/uploads/files/gidopaxare.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b45d1a51b33079ae0b1cc6075a6eec/4473861525.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a6fa3525d---roputixolipexoxupada.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e17c353---jupomekebemojux.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7488e384d---78738474819.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/93008107283.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5d7750e1b839797d58748fff0492468c/vopenoripulokagirativino.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d3a388743---moruje.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lidafatapotonewakidako.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b80fc82---93764367160.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/91a501ed6fde4622a06d01a1baf0f382/ruxivamafiviso.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/zijukavejiseduvarowup.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e43794f6868c811612fcb1edde5e6dab/fuxugakitipufeza.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082436040d64---38978266337.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0e85eb7e3a8ea596787618dd372bfa/ruwakogo.pdfIn PDF document text
    • https://patc.fr/imagesfile/95274878317.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/47452246343.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d657074489---36036978694.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/44845386919.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6nq9bps7782rmrb3sd36cvn4v0/nisotutiderikawitog.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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 10636 bytes
SHA-256: 1ef705b01a9d0209211485e9da6abae76b651ad04d0c005899786cc889ffb9d8
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16724 bytes
SHA-256: 6dd30d2b9cc481c2ab6b0abfbb33520f1ed4192146e45bab509a536c099b688d
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.