Malicious PDF — malware analysis report

Static analysis result for SHA-256 2064559a673fc22d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 18:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9bd680f92d1baff07247efae6c0c4bd SHA-1: fb799c0490cf6eb176b82ea20772e174e6a56bfa SHA-256: 2064559a673fc22dba91f6f0a3989e13d42aacf0a073ee7cb797771d6b6a27ba
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to external, untrusted content, likely for phishing or malware delivery.

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 https://fontaine-eva.fr/userfiles/files/zepulowinexi.pdf In PDF document text
    • https://valstybestarnyba.com/upckfinder/files/4792708429.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b66eee67a---ziroxafigul.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bcf0283b0a6a504cc3336dc74dbf100c/dixasugakosorupigo.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/radivowod.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0ed0c5c197a0e87df3676ec8aed16359/visemirivi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e46e86b3a---turegetiroduliwuvemil.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9eb4f7c5df82f5b6aae9fb5ddd18d824/58123114050.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xorupaporarokubixuzi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0ccb7b415ad684b134c99f296317bdda/43578479515.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/kemuvumorabigadaniwogone.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/jibaboxumigaker.pdfIn PDF document text
    • https://triosms.com/userfiles/file/14426889016.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/38569572913.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/wabelemozegeku.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2h8icomk83r7j5ca8ar8i1plqg/mufamorokororisadip.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7lp5ht3nclcu0ibskor5jr4f0g/rupidubujawid.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a24ec61b6---vodatewebi.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/27902497864.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bimem.pdfIn PDF document text
    • http://com123.vn/uploads/file/35422296324.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/jemurosuribefipusufam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=slam+ball+workout+pdfPDF 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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 10656 bytes
SHA-256: 76804fa008d31d0700e0c7a873c2eeee2e96eaf6746cbcdeebf87df86b8f228f
font_01_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 17512 bytes
SHA-256: c7ffa70c576e39ea98103e35e40622549adfbe4dc158c281abf410af0937167a

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