Malicious PDF — malware analysis report

Static analysis result for SHA-256 46051c5a97adf60d…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70728cb3dc52a51d7bd6f5f795a6667f SHA-1: c4585be03a9c445e7f1a7de0bcaa4496f9437ee2 SHA-256: 46051c5a97adf60d83150255e699ac193f63b94aa35be39efa81efd2e37eb74b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDFs. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877cad2638a---47238669796.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/4i4a57qtse57ojf6j4momvce9v/59358902840.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ntq00vrl9e6abv7ehdetbqqiag/16025580084.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/37c4562469a8ba53da87ed5bdaed4d9f/47978261883.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72752e99390ccfcaea3933554c1e57a2/86112362323.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72f6e764d4---japizu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b27d5c8077b---55175546927.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/79f5d266f5548aec410bb6969ff5a1dc/64411186100.pdfIn PDF document text
    • https://samowar.ch/upload/file/nadidukozuxiberotixo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lomudif.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/51c2ec597b6b3aaec88fc70e9372e2b4/36543571773.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7a1db76---27020614705.pdfIn PDF document text
    • http://chinahongji.com/d/files/jufogelapunugosoxaxefuxoj.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29c52a8f---9902105748.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvk8nerkda84n6qd9530t2ia64/74384864470.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/butiwuxatixuredevolot.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ebe3cefd98acb978336477460140ad/rajuwusuzi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bagotujajufotep.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/253ac728e6baefb4191173534828f1a9/palakolurefed.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tmdld6ulrvstqab9b7e04pt744/sikisibajusegag.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rijojumaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=racing+thoughts+schizophreniaPDF 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10812 bytes
SHA-256: 37c545b847502b6356ed76bbf15ed17fb8160b55c1860d259a0e1e5e8c469b92
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 16700 bytes
SHA-256: 46c7a9fdaab5e601c582a9a5804579c427490610533772054d3bb02db52b9e56
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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