Malicious PDF — malware analysis report

Static analysis result for SHA-256 219d447b21e2eb5c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 14:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a16e7784700563e095c0becf1ceed8e SHA-1: 87db1e96ab154b7d5abf00baa19d0db79c9d70c5 SHA-256: 219d447b21e2eb5c1616eb05f99b371996ee6fb3adc23c55ab6e4483c2b15d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a deceptive link structure.

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 https://bselink.com/userfiles/file/didutoberidotaxowem.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608a03031f8a2---11960178555.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/86502799357.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/tizedomipopojejasax.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae24562f4d---17584376325.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/vuzamevaduzupezawida.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/78262104186.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24fcde564---bewukugaf.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9570d90136fa5499a51cb4080ee32968/3473477572.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dafea6d7981b998278990207acd5c0bd/rivowejiwabakitixavuz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b22540e4a---lotetipa.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021725628127787.pdfIn PDF document text
    • https://highrise.pl/file/lulovojufariwosiwupavusak.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210826184136.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/30558781261.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254eb7bb3fa---91596500119.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/muzawef.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab32f813b3---pupujimusowuterufurizo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mulf9nlj44mvk2qmp64epson87/vivurotiguxaxexinavafejo.pdfIn PDF document text
    • https://businesslife.com/content/files/lemaxovi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da74553d8a---48502616538.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb706b9e1e---56342013170.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/1635018265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=microcontroller+books+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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 17040 bytes
SHA-256: 7ca188eef86ecc2ae50c250de2249c38f2094c7a8be000b828d677d9f961f370
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 10676 bytes
SHA-256: 8a5847bdff637ff28c1db77199d1ae94c311f379138fd37e95def58da1702bef

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