Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf98e96d7afd788…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 13:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02468821b07f8cdcd6799f2cd90c8deb SHA-1: 754a79e56aabe3968c810e8f9d9b9445aa54a2f3 SHA-256: 1bf98e96d7afd7889e328590f6fa2faac7a52a547d5b0bbb711cef38b0de1df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and link farm structure suggest the primary goal is to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=manual+handling+injuries+statistics+2015 PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d85369f2a5---78340187934.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/18003129562.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/98704287228.pdfIn PDF document text
    • http://lse.hu/userfiles/file/nofikolix.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079b93c035a1---16230528956.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/agqtvdreq1nt645v25shho2klh/46782213493.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pinagojumaxitodofadiboli.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3c569d003938823ff2dfda588acd59f9/13073571397.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/64828140248.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29dc81400---jedasuna.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/83111246978.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/lubudokadifavo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/75540094057.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/penorojunejejesezisegen.pdfIn PDF document text
    • http://medi-sen.com/files/files/47037150642.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/29032433981.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/16485055577.pdfIn PDF document text
    • https://ghnservizi.com/file/paviwojuwakigo.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/zexupodixez.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/limufemodonabapajivejekas.pdfIn PDF document text
    • http://web68s.com/upload/files/rowepemasapetoxafa.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607edef424ff6---rizefanixajewepetumomekof.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sawuj.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 18248 bytes
SHA-256: 328d575bc2bd449f7a8a43c182f070e72ea8807481766545ece64624290fd833
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 11180 bytes
SHA-256: bb76aaafc0fc04bda7d3ad5650ed6a135ab04a112d5a7eba84094131eb101fb0

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