Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8f3ff199a1bd50…

MALICIOUS

PDF

89.5 KB Created: 2021-06-13 10:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 776193b4c341bd7339aef28f982da013 SHA-1: 11557a82bac40bd2d52fb5547ebb5f8c1cdf5c50 SHA-256: 2e8f3ff199a1bd50a4d0bf6f3a63c863f2399c4ef0905400f83d4630377d7686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=download+infinite+flight PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b1bfc5f26cb6a690e7e47d48e595a898/65484014820.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ac9ec1ead77be831f4fc8f82b94124c8/gaxaxu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcc956763f---nozepunuvigegeme.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622155895.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9939c0fd23adaa53410b1009aaa9a7d/28669016236.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4ebd89fa65aadb555a6abcd3c2c81607/65210310089.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1504f9b554236f43ab72fbdadfc85e04/51047290057.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d29f75a813ada72419c654ff9eb9898b/95535655312.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc55f89b46---gimujaku.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/67960068920.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a20332b2e02---41831909457.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/nadeximowaxoxo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e644df8e7---203515271.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9456287e6d6d95d2d10dd87db4a6764a/jumetozokubik.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n9ubk8pcntqdoj39qgjrgfctb1/lopagokuvekudatetix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 4772 bytes
SHA-256: 4926c0d48bc6f92e10195179c7ae8434b0f5642c606a0b05137d766e8131bcb4
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 1816 bytes
SHA-256: 202e48f87a554acbfda3b1762f215484d20ec40b08ae363e3a41339d0d0dd0ee
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 10784 bytes
SHA-256: f6ce3e857cc88be57609baa2b1fc7ee41ab648f76829bc3a5a19348ca074b291
font_03_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 16184 bytes
SHA-256: a6aff6a43d3cce4813d40d03e08483c84c65b4cc4faa8b4587d3e6d21e8e8151
font_04_sfnt_off000149e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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