Malicious PDF — malware analysis report

Static analysis result for SHA-256 830f5ace0654c8bc…

MALICIOUS

PDF

85.6 KB Created: 2021-07-15 09:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed9183f8bd811bc26e6634b6db575bd7 SHA-1: 535aaf277b45efa3dbb28a13eb6d2329e0adae75 SHA-256: 830f5ace0654c8bc426b9bd6a1121c48c015aacdf9ece91516b0304448d1b31f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=two+layer+feed+in+braids PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfdb89286---9896398539.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9206a9d7b1b5567b916c31962c1160db/49392219143.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050308012973499.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/53262303011.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t4n8d3d3p21rpva9p9kk6q21t1/rotororigoz.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/nakaxoxubop.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/26110811063.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/navunovupurabijekujav.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jm857sc0h9r4lj9qk9ccvn8hq5/kulukofosi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/559oklj87gdv2c2hafaqs3g6ja/zarixozibaxidop.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffae05a428---18114374433.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/10215132120.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/lukukuxafavevujuk.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/67232421059.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/lupigowodinibujabaxagi.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/34325243011.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/junijirikupevumuvenafug.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae036ddf1---93993137763.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lef2m0agr830s3oae8g4s2kgnu/buvuzaji.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/083e1q75ib046hgnqgcd0t2517/defapivexotenojijegazexej.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421cde9f2a---45932814389.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/79940798287.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/rujalasonovutajitite.pdfIn PDF document text
    • 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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 10552 bytes
SHA-256: 3c2d78143d590d9b7bde2732db40b793a6b8c5b6435e327d2f42b1640c04e6ec
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 18116 bytes
SHA-256: 387a368e9ae7ae1cae4fd12b79f0e7a4fd26feb19c91e3955727113ca9335cdb

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