Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53c7ff4cb57c2f5…

MALICIOUS

PDF

78.6 KB Created: 2021-07-18 06:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3bac40000c28c07230ee3bdc35b6a3f SHA-1: 758427a74e3e0d3c9d608f6aba1c5f4165f9db74 SHA-256: f53c7ff4cb57c2f51b1aa078091cf4237b7cd85c9cabc28adc2c981607e77b4f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97baec13a---gajemarejibuz.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cdc865a9e---kuwelujibetikixizi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/vozizijav.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/bofazudulagovewotala.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/38902708368.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/584791e58394ca4db639cea0164ddee0/luzap.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/53133057607.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8e2vgbnbfga7o3nuc5o11ap767/ruwomaz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d7a4e1c94e1dea5b4923ab0b8c47f9d/mabamupujusog.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19970778753.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/62133581766.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/78a39cc974ecad4a52c7afc2a23c6de5/punakurapofuxudored.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff876db915224436dbce1cab8a776ecd/bumutolil.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wivivazamenotaso.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694b0cb9c4---91632267257.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/81827389122.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d766de5554506ce3daadeffc260224c/gukiserazutajazeginowu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/111c55338d1bba62b80c951f22896d18/99638137492.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/jifikaw.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/13061884187.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb32dd2cfc---13371800314.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/79960630ac558408889f3565c56773b5/56979118380.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/xafasowikovulofufu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/46667186907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=6324+to+the+nearest+thousandPDF 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10748 bytes
SHA-256: d3989e5f6c08833b3752c386ab97eb0ccff815125c4b562286ac82e1cf760c8b
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16684 bytes
SHA-256: 8d039f53894d654142c88f3ee4e27acff4b8124aeaa3e00ac6caa2d2550d221c

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