Malicious PDF — malware analysis report

Static analysis result for SHA-256 2793418e3b45a3e1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 08:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c08233f41594a360436e4e4179622538 SHA-1: 41883e84c74ee1a78a97d40c732c748106f6b392 SHA-256: 2793418e3b45a3e1dca442dccba05550fc76f3f6958345090c3f1a0c0cfb1823
156 Risk Score

Malware Insights

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

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 multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16102ee2fda0c9---9463221090.pdf In PDF document text
    • https://uleshuzataruhaz.hu/files/file/wuruzemizosi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ap4cigibcf0qfftp61rlajmu2/xizixeluzinesuvisaku.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/61370178634.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsh4kg2tck95p25vtgfr4lmfvl/vudoxel.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/16117034384.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tefulubezajawok.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2580e4ccd6db7a4942edfcfb5ae715c2/xidekamojodopogejereka.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/37494516012.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/586099742503b25e32ca2fc59683df27/20813894628.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/84273795703.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/17903620768.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/15894130836.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/xokepetudetisevibi.pdfIn PDF document text
    • http://gtshotel.it/images/file/wipipodigowinaxotawizo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50253fc7b---65825893340.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/sijefivirefopa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xutawarotavafu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5566488a81b6a85f4f784a50ee7a49b/jeramupegusi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ba3e4e44b5ca9ad108ba2809daf81b29/37589961559.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4290e5a4---diwejetesixanewuv.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/6215941686.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wototofunogenerame.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0922c4251d---71187826700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=potentiometer+practical+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_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 10616 bytes
SHA-256: b5e504ceee45ff692e75bacad5ae444a19b7771132ac57143432a547bc0d21f1
font_02_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 17256 bytes
SHA-256: a29f4e3750a1a17257eb676281b9db579cfda34959b490a789765c9e632ec517

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