Malicious PDF — malware analysis report

Static analysis result for SHA-256 1128a3304db234d3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 18:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88929dd1fb64ae2330eec104d3a09e52 SHA-1: bd07a7dc4ac140d4328cec3e48aa0b78dc993dd0 SHA-256: 1128a3304db234d3d456faa1a87b7cf6710f97ddaf910ad1bcc01a6450b7fefd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kolesnikov.pro/ckfinder/userfiles/files/14921015366.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ahjdvvu3nmpmtmv85do42hc5n5/50425071663.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/88473631579.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df94915a1aa---vurikiberotuxuxubaguka.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/43405955807.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/45901021436.pdfIn PDF document text
    • https://tigaintan.com/contents//files/409130418.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/dojipun.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/13348940488.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uo78nd1icoo32a06fvmgt3p926/nofar.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kulawojuvarokajuna.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/52590116377.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/mozoxube.pdfIn PDF document text
    • https://triosms.com/userfiles/file/37785329535.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/74421841171.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/28680475278.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd0a7720e---8516578022.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/momuzomapadimemaxabijo.pdfIn PDF document text
    • https://signika.pl/Upload/file/nafiregowowupakawetonif.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088795b9799d---91235126459.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a7cf43cd3821f3ab5659e180423ae1c7/99881791575.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/molixi.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dunekarila.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7fa8bd57776ee7e4fd02f3a617da36ae/51545293849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=displaying+data+worksheet+tesPDF link annotation
    • 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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 19052 bytes
SHA-256: 0eed2c23dc5eb56f4c3bed6088ac645eddb8c8e3f55570b775e761749f317d91
font_01_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 10964 bytes
SHA-256: 13ec41f1cb8ee801633647f98a94b55ab20586d653218d54afaa3556fdb4b0a8
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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