Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1600d65bd1f8f10…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 15:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7c56639e0191fef841d8c2ea4a990ec SHA-1: 81050016b81841a1864d6ee7b8625c4df00695da SHA-256: e1600d65bd1f8f10808646f5866b8cd59cdbe4b0e67e6efde564b9d6bf034701
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which are likely used to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of a link farm on disposable hosting further supports a malicious campaign aiming to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da9d2325---falikolebowiko.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/40d0eea0da99a5f3c0a53c5bf1ca4c90/28777577366.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/805f1a7db465448848d93ac1a38d6c34/wilujakajuninak.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gr14qmfrtp3fpivsrljr1btq12/dejigasimav.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfc279de7---xujoneboripikatofotogo.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotavuxuvinovutipon.pdf
    • https://arhometutor.com/userfiles/file/susedidesajibunawo.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd879e31f9---vivetokawoxilidi.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/5216523931.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bpe5ang2egguoj8vs6jt0ov372/voduxokuzunoguxute.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3299199fbeccdc114861fe0bdf911784/84077867696.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0a7942c2---7046706328.pdf
    • http://bestbuyfromindia.com/userfiles/file/23551725273.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0807b0ef4---23478308466.pdf
    • https://alamansyria.com/userfiles/file/wedetejuvemofikokevisixug.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zosajunalamasivujulaf.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cb50a13d---29613567390.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/rqu0obg76q8ne4ptq3e6f84rh2/paxom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=marquee+selection+tool
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed32.bin
fc86019457eecf77694bbf426ce881ef711e48e4e7eb3e6af9c24d5cbf5a7621
pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 17804 bytes
font_01_sfnt_off00011b31.bin
43be9f4a10aa2d05cfff379df44ea6c5b1071d1cb398a24e0acf87a65d539f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 10460 bytes
font_02_sfnt_off00013312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 16792 bytes