Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bce2529fb280934…

MALICIOUS

PDF

97.4 KB Created: 2021-09-20 01:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08048def7fed8977a7f241ac59b8f5de SHA-1: b40403b702b6a34bec90e1fab4e20c1910221ef4 SHA-256: 7bce2529fb2809342cf22bd4fd8fd4c1bc28f692ca965a5645d8a2b7f00e5026
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=movie+download+tamilrockers PDF link annotation
    • https://gogift-it.com/userfiles/files/24918833523.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091419163672.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/23611195585.pdfIn PDF document text
    • http://wamer.org/userfiles/file/99422421485.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109101102419886.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/dusaludodirixonub.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/56684091418.pdfIn PDF document text
    • http://eternoohydro.com/d/files/wopagevamakosomim.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613762cb7580c---85781344674.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614269b07bffa---30295008307.pdfIn PDF document text
    • http://voijin.com/userfiles/files/duvirabam.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/90226253872.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d21125212---82343164528.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143881499bd2---ralil.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/81183070845.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/7587643168.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4d6365b6---47327242334.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/3078714627.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/11293205531.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/49242141981.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613080ffbe431---10427253116.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lovamusoguvukefativifazen.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/86069934016.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67076484444.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_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 10768 bytes
SHA-256: d99ef85317ed6d44acf3982523952008c8e0256ea5fd1b2e0a6737deeb91ceb3
font_01_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 17460 bytes
SHA-256: a3f8ab8eb989c683b30f930645a0f4ba83c943a17481206e3a8dcef76721de93
font_02_sfnt_off00015ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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