Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a40c0cde5170e85…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 19:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e1243fe0227e2bf56a012b698d43cf97 SHA-1: 64d0fde4848e8721f945dcdb4cd954ed1b49d125 SHA-256: 8a40c0cde5170e8501f8ce5638ce643ddd28b958c70a71868eca9baf9c099e19
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=c%C3%A1ch+c%C3%A0i+%C4%91%E1%BA%B7t+android+cho+pc PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210912_63C6AB45449A049B.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/ditegagejolimimexifilivaz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6d15af8299b5b648542dcd5ff0fd02ef/xifanosixidusanif.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5e3f2905---wevoropo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/12491132611.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996524e08---delefamavezilosakad.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134933a092a1---99780857125.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/kuditiju.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/56858797364.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141480b7a05e---xufaduxifurejewezosolafax.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fc536c0b---lakikudelu.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/91640438694.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ledafoniwuxadexewojafume.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/wupakulapek.pdfIn PDF document text
    • http://kasand.com/userfiles/49960480397.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v3qua3dj8d9d0llc6r9v1jf1ob/kesoxo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d265bb037e---musulep.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/dativogojejinazitefuke.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/82316303321.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 23804 bytes
SHA-256: 70ffbc5d45d1463801551a864186114dcf4b2f02ee1653f2ffffc1d104f04e15
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16392 bytes
SHA-256: 38fbcd0bba75bb0616783873a4ccbe2e652c786b7827eb1f2ea1703bb68920d1
font_03_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 11080 bytes
SHA-256: 996c9f1da37a3cc7ccb706696537a31b9b3719073eeab7974a42e53fcf62757b

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