Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c1d7757d377169…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 22:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 400f082011b914e63af2534112e8bf4f SHA-1: 240141940ecfbac022e91b775f7aef0d3183830e SHA-256: c1c1d7757d377169ad6a05e9943d7d2a7c40443cbd95d1e73f15794a527eefb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised or disposable domains. The presence of external URIs and link farm indicators suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/joxuvaxi.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3dfe354c---relogadikujela.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b39de5840---20595532427.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/60410044482.pdfIn PDF document text
    • http://adice-area.com/pictures/files/kenugifuvibigedowuziw.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204554909259.pdfIn PDF document text
    • http://armanetti.com/images/penetimodusuweribujav.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/pulenimubegujowa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607130251cacc---fanegejakavoxi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062223115866.pdfIn PDF document text
    • https://maturana.cl/upload/file/42927326911.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xugibububinugu.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/zurukobedojewubeji.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/mazebowijemabajudo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ebe393fe9a1c36e4541e93aa536b8728/72350250496.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c46c136b---xuwuxikiramitutisobir.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/50825593040.pdfIn PDF document text
    • http://fygl.net/uploads/file/242127482270.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2egne3pb7i73sobgjdl75tavbh/tapinabositixukezununor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7950fdc2e5---wafizumulitafajekideveb.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/tusinasukujuxuxapikolan.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/dozakajilaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=philips+respironics+everflo+oxygen+concentrator+manualPDF 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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 17356 bytes
SHA-256: af7b1da421731a40a3d2d42530f605e454c4c7e2f6be035f4ce4aa3a10605248
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11312 bytes
SHA-256: 689fc7fc144e7ad1adb2c5451602fc99dc8609b3db23b50bfbdb00873cfa9632
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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