Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef82af6caf1f7d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 12:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e09d0dfc4c76a7a328d80f98e7c757ac SHA-1: 5db21abef5a03877f94cd86ff56655d1bc523540 SHA-256: 40ef82af6caf1f7d456491be1bcb10c98434919e00e4f279169969424313ddcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=tv+time+android PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413cc8b0827---74945008335.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/86866606474.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/62580300310.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tojoxavaxetusubugulevij.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tomutamezimuvi.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/jebipuzugikekabopixit.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109052049433232.pdfIn PDF document text
    • http://mfcpavpos.ru/file/57943365242.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/sibovivuk.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/nifadizigewitit.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9383742273.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/kanebozerobafaji.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210915143306_mkwdgj.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/lebunarelixupawev.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/dijamujunuzakoletu.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ranalunumabinujivujufe.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/8426034860.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613268db33834---83619705532.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/19185476675.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/berozejajujapituxaxanas.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5b83349cc3628a832b2328a231f22e7c/13664584548.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5498a980---momoko.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/wunesufagamelozoj.pdfIn PDF document text
    • http://finchamauto.com/pics/kabaxorux.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec18addd26---jugoketudokomadesuveno.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 19040 bytes
SHA-256: 3e50c04028a968af3cc42d1bb7ce6d7f7d6bd65a9a10336978b1a27853633477
font_01_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 10224 bytes
SHA-256: 85de1f5d5c9d6138e93714dfcf571b37627686e1d77fec688d45452cbb4b677e

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