Malicious PDF — malware analysis report

Static analysis result for SHA-256 424a706b721aa215…

MALICIOUS

PDF

125.2 KB Created: 2021-07-08 06:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20b565076f259492067c0777fad3c690 SHA-1: 0f9bf30294195af3ec8b6ad263aa85179862f279 SHA-256: 424a706b721aa215a3fd2b44c85973020e4e218d5e2f9955bb75344178b5edf6
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. Several heuristics identified the PDF as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/50grjg4sm6mrhh2jm4aa3atfrv/66126147733.pdf In PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xekujivokedan.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc34eb70cc---61545669849.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84cb3b318---lojonam.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc629a69057---semamivirogejoxoxug.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/tumuw.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vijepekakufudobew.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e769186b3e---53772448122.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24724e8fa---8391762216.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5a84169a23270eaf2483d1e4a13ebdd9/gesojimifalexuwi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/26399116095.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/fovabitazajana.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///75184108032.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8e45950d---zalomaweputafivupejusix.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2009cd66---16288403985.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/507fe3097c97d9cca366b72f5d5c1eee/nibefewajujaso.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/kivitik.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8d0b1d3da8fd74df251a965708a753f/wuvujoliradolubofirel.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/fezexotujaf.pdfIn PDF document text
    • http://dzbnf.com/upload/file///rofovunifol.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd641829c00---76798340165.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4767ea85d5db8b94ed28e7ad091fd448/wukiwer.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7fc93048---34036537775.pdfIn PDF document text
    • http://markone-tools.com/upload/files/ledigekupurapig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=questions+on+vector+addition+class+11+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5E 19796 bytes
SHA-256: 2eb013a7f6dcff16bbb16d0ab2f523f787a354d13ce31065dfe2be41358c64eb
font_01_sfnt_off00019f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F91 10888 bytes
SHA-256: ee54a63545632294b4deee7cc6c313ccef163491fcbacdc119e67d05279434b5
font_02_sfnt_off0001b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D120 16144 bytes
SHA-256: 1bb543891201b86cb218c82ce0c1e431878b85d3145a79f40ea94bf38162e691

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