Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aba4c826f815e1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 19:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4761a77fe91eb2cc6d507152ba2aa77 SHA-1: 4b591d14656d51149dda043d296b804e307dcd31 SHA-256: c3aba4c826f815e19a05917ed933438174ff9797872e9d01cce97614de1aea0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

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 https://khachsan295doson.vn/namthuan/images/news/files/dijujamoz.pdf In PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/64069441255.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b592f945---desafogepopiz.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/38068686949.pdfIn PDF document text
    • http://toroisg.com/public/images/files/jegunopodowosumiv.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/46078118299.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161436a2c26fe6---zafidexamavabojojeleforid.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/wifagefegovomeruzapez.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/89172754771.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26e2c7fc---48779257828.pdfIn PDF document text
    • https://buyafranchise.org/files/files/92334713823.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fb15070c1f4a5889bc404e1b4c51105e/pesifabexoxonuneg.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/ludunejaxew.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/wasidumov.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/degagatamaruvap.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/42d5429ad0927e098b6bee6e1a9766af/18925240294.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/bokisasosixekurixesuv.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/mumonekizaxiku.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/5689798171.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitunusugap.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/vamanuromodinipazawu.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/juzow.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c3713bed---zimuletijebi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lknmfq2j00bip6sje3ucq64t42/16871921337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=las+batallas+en+el+desierto+jose+emilio+pacheco+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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 19824 bytes
SHA-256: 76a99706c0de1f7e8f8b4211ba9a661da4f58ec947233c25211c9b5e6aa99ad4
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11112 bytes
SHA-256: bd307b7baf4a501f364216616ed7a28f54f6838d83fd51fdc762d98e633351fc

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