Malicious PDF — malware analysis report

Static analysis result for SHA-256 9580582a3c65c731…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3a35302b8f279cb9c3b9907d72b0bc SHA-1: a1af00daa65272396d8c1f5fc550b453466bb148 SHA-256: 9580582a3c65c731dca1525c4b9cd15204612f0d6374aa9e0368de35b213d72b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of invoice-related language further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=ccna+chapter+8+exam+answers
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aa27b760f68ac7244ca3712bdcc23e66/25242683346.pdf
    • http://kielcenoca.pl/files/file/piziguzut.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610326761180e---defuvogupikiredafejenu.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/pudewulorelutofipele.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bd883b0aa---dowalipugobolisokijarob.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/gesolulelu.pdf
    • https://kuraniterbiye.com/resimler/files/60077305796.pdf
    • http://alituncer.com/userfiles/file/33460166071.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b228af2cb3f---sevupigoxilenujuxogi.pdf
    • http://afgventuregroup.com/cfiles/file/80428374303.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/c2500482580e0e2bd727058176e7af36/liwefaro.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2ef69c8e---wukifosikodipavid.pdf
    • http://ilink.pl/userfiles/file/27971680380.pdf
    • http://kengosushionlineorder.com/uploads/files/pagurunupegej.pdf
    • http://eviljoy.com/UserFiles/File/66454698833.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a71bcb9bbe3---3007493103.pdf
    • http://circolonauticofavignana.it/userfiles/files/95497191927.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d71196fc6---64573084694.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2fe0bf089101fb6adb2cfb86fb6c54aa/fakofudozunetubizobinu.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/6611098036.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/63856213360.pdf
    • http://velocimapper.com//webfiles/file/nalevojojiwoki.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c946543fa15634b8328364877fe7ef62/suluxexebabiselojaripe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e9.bin
b3add5249ebde92d8666d6124eb6127eb3a4801849319af3cf25b51f9997b85c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 10808 bytes
font_01_sfnt_off0000d9ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
font_02_sfnt_off0000f1dc.bin
81dc42578376e3d5baa69e3f5ab88b3f16072c38bbd43a501c0532cb6cc2f2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16092 bytes