Malicious PDF — malware analysis report

Static analysis result for SHA-256 49877e5a46d34e2f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5fa6fcfd055b60cc8402f58a3927e8d9 SHA-1: 5dcdff8a1d7e0c2059d16baf84cd754b7ffa2832 SHA-256: 49877e5a46d34e2f40f8a51d78d1f3b6e1a7aa615af793c330298f168febeb19
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 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=feelings+worksheet+ks2 PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5301a2437---78915224555.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/newokozotudu.pdfIn PDF document text
    • https://anaksemut.com/contents//files/56570114108.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/13881511736.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/30563055954.pdfIn PDF document text
    • http://teresachild.com/upload/files/fulaborevafe.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/xibipobi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2bcde71f---gupatavoz.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/84537215971.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/28153488847.pdfIn PDF document text
    • http://funperm.ru/content/file/1194123864.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f460d4e43---zekesabevanugaxurimelufep.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd745054b9---tajanovifizaralikiritaf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bc067b55---sajisagatimanigexa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/27788937515.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/69008102894.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17991766379.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/20939646296.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160cd976f7bfc6---madufixesaxuvibinudo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/18372edc110f4b2a8cfafe7da6ba4c73/52627426599.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/99962910087.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c326063e2501d4b5e112471a876a50d8/32374523098.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/29f8cc212dc7ddf39b9c0e440739e6ac/bexemefajunokokesijomol.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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 10500 bytes
SHA-256: 7825eb8989609bd4a765d9c1d7d9417d308fe55df31c6d40bac89c1730411a47
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 17152 bytes
SHA-256: 48c7fcc926f1323276b21bb862c7de9929586c68cd172d5f1debbc250ff732b1
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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