Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4e07a3e024578c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 01:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5a46e984b7d56410e3ab22167f8d5747 SHA-1: efc17fde12e38ae96faebca40f1a4f2bf1f80949 SHA-256: 8f4e07a3e024578c18ffbbb315384047f6086fc8722b16127e4e137ff730c7b4
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 0.9991

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 http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a5135fe3---3709305089.pdf In PDF document text
    • https://amatnieks.com/pictures/image/mexugopopisavetikudufop.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/17268501908.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zasoxajekikotafu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afe40e27ff3---fubigasalolalavate.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f55aa5c761488208e788d95cbe64479e/97266561571.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lesifutamelubezuga.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/76265827462.pdfIn PDF document text
    • http://dhf-china.com/d/files/rizuwilovaximisixit.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/36110832168.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/de0bda46d9bfde07b8f42daede9a072e/73873349696.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2f04889b1---vemafexituwubu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vinilonamemopazasubafunu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5bd4eae69f103fbb27039ed034c5ff1c/31712848095.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c20178797e06c63d800e3957b0746fd5/vitogatikisutadepup.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/87111956501.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081137ae3702---64197687927.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/88169500088.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/rezelabat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5260n5t8jg1kao1kughgd8hse5/63410137234.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099737c67fc6---51508385151.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/17889889232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+diamond+and+pearl+nds+rom+downloadPDF link annotation
    • 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 17884 bytes
SHA-256: 52d2c6b6ea1026ab81cf9b2696d141a78c32d49c75cf3ea9d24f2cd0f056c6bd
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10636 bytes
SHA-256: b0fcc2fcf0f46cb921a429d480e42b3f8f6f86fdc0b2eb0ae40c9c7f32c03ea8

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