Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56fd4e55c773682…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 19:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00fc79414e4adc9b4e441c74220ee0d7 SHA-1: e32aa564c74d5889c899cf9a269dffd9bb47b6ed SHA-256: c56fd4e55c773682b4673e72ec659fc572500c28046a06fca2e5d4fe3a672c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The PDF structure itself contains obfuscated data, and while no scripts were explicitly extracted, the overall pattern suggests it's designed to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://studioghittigargnano.com/userfiles/files/xuxixebu.pdf In PDF document text
    • http://npas.ru/pic/file/63808255040.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/50923425156.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b81b44a4---vawosete.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapukegipi.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/65362882142.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/178b51ee6a8bd7d6cab1c3848e144e60/lugijef.pdfIn PDF document text
    • http://hbaoge.com/upload/files/rogiga.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/11057584808.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4200548b7---66905539649.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909124938243.pdfIn PDF document text
    • https://andana.us/files/files/43920801883.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zaledenujivepo.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/95006637398.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/86994436284.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/delapibimonubu.pdfIn PDF document text
    • http://nineslash.com/user_file/file/duzaxunivazomuj.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/57548804022.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/popemapizuvoropurago.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/mupuzuvivisev.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zepuwenejenafu.pdfIn PDF document text
    • https://efnnma.org/files/file/60489559852.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f1da7ftac8donukfjc6g21j075/65863728735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=watch+archer+online+free+putlockerPDF 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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 17884 bytes
SHA-256: 7f197915a0bebe2ee9fe47259cb9d2e7d9250a09f3be4ef6a1d34a8b9ecc73d2
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 10592 bytes
SHA-256: a4085932af9603cfb28b39c2bec0d1c3ccce28e6934e234ebf56f499210e7d2a

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