Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff87894cd11991d1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 07:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9afd8548bbc187d3dc766ffcb836d3da SHA-1: 7a915f18510e98c23fdffd3b1623785b5e438c17 SHA-256: ff87894cd11991d11abd78ca9e5f0a6e56ee6e3a870edf638740104125245651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=basic+electrical+engineering+book+by+vn+mittle+pdf PDF link annotation
    • http://hanarotalk.com/userfiles/file///pozedowuzapanezenije.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/91973285053.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161060fa65b2d2---gijelozifaji.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gopawodegizivumudovud.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/30616654105.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaba75df1f---galaxozorex.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/66788465e43b7ddbfe4418449d2dc899/44662966102.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/db089dcfd39b5de10cb7a1037992de0e/92313864167.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/zumowubavapebenatilafifi.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/tusalolo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/dabubaduwomelofuwobid.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e8fe3bf8---73684739862.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/58155079306.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2603e3e6---vafabebimadejuzewaxi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xunetonedevizaravavalaj.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vadeto.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f214b8867e---57823704806.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b2u6h8n7ismghjaptbaddtklfu/maboviwewuxe.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/43982843166.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/miwabexuf.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/26720046897.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lugik.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vuleduvo.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/kobisokejef.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609841b98df0f---34413179794.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/45suivpaskal7gjb94h3pq6qa9/22900291499.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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 17232 bytes
SHA-256: f498c827a755fed03cc807164691842cc6d83a007b5e6a6d06fe2494d1549fea
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 11428 bytes
SHA-256: ecbb0b6db5870b50b462caaf83ab825b662949562833e2945ed79f60bdc005aa

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