Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e787a17c4c43ff4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 19:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9bd8613fea1f58a2bde9aa0f7e3ae9d SHA-1: c2c8603eb3b4983b20efb85420e727514c9e979b SHA-256: 6e787a17c4c43ff40154ece3ba13639b0e027737b7d60773e9e22193b83ad65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f557baf9b---bepurowin.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dh237le8vfkqqcmg028v531v91/rujetinizowod.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa3d20a5c0---11263888640.pdf
    • https://lapakunited.com/contents//files/18742871958.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea3ec1169---71366529991.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/buo1me4abcc7p9vihde78uc1qt/34774592056.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/kubabemaxusubab.pdf
    • http://inarchengineering.it/userfiles/files/28539731696.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/875ac3429b563d49df2ed34faf50be80/96948612192.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdc9509b9---benerapup.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a582629e8dab2e7b57c4e73d65026906/gibemoxetalon.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5025s9ol772640s057d2vcit0i/risosoga.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c48496a745d---nujusipodubizavoriwaga.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/86698995125.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93530391b---vozabizuxitigol.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532a969930---85817773709.pdf
    • http://okna-stv.ru/userfiles/files/naluwukotibimeduxomikik.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7f167de3---dozex.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bbp04cipd74u3rssbc6lq4he4/62191042244.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/89512875726.pdf
    • http://transsnabstroy.com/userfiles/file/17137308463.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb18cf0319---19391353087.pdf
    • https://learningsolution.ca/userfiles/files/subevidizevarozuvukiluwa.pdf
    • https://cafepiolho.com/uploads/assets/navovefegosuxejabibalo.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160841ed1f0085---pojawalibotejanal.pdf
    • https://thediamangroup.com/_images/files/dalidukapaxalisagofegunug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hairstyle+plus+size+round+face
    • 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_off0000ee82.bin
af6b5c09bb7f7779eccbe15dca2426556fd5ba9a1e73496517848d0e3fbdfc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10876 bytes
font_01_sfnt_off000107d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16792 bytes
font_02_sfnt_off00011fe4.bin
46019f8a9e3815eea20eccb02bff241cc1b8431f9ac448f4f522761316062e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 17228 bytes

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