Malicious PDF — malware analysis report

Static analysis result for SHA-256 380325218f9c3509…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 13:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e714625fc68c09d1da7ee56b452bd38a SHA-1: ba6d93b933f6c4128b45b7063aba866518a83cb0 SHA-256: 380325218f9c35090fe5c7610ab8564d7ef4ab3b7fc2f2f3c006ef6ae1b424db
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious intent, likely to trick users into downloading a payload. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://toanlinh.vn/upload/files/21225513459.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/pitugenuredewowivawanile.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/padomuwatikufitejinu.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/tamagap.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614147c87b18c---banaxegulirezatagap.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/32949520124.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/88524727133.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/dabeki.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87064123472.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/167jrntmlu3nl67ils367n5oi0/zatenijifomogupedugiwomi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/fodazumepidelotigogugikow.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/49138799634.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/91102443000.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/webufaninesovuzule.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/molubijozadava.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/22560966958.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6d703306fe88b009a638e38902e70ebb/39795002921.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/55804012899.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/47946913788.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/sexisaxobaxeg.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/josebukavokomoruwuwalixad.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613273ae9f50d---40472630627.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/309efd67bad9b4b124bcd40ddfaa1013/toxeviliju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v+mod+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 18204 bytes
SHA-256: 2d4ec0167213b1947bf7982d5ac348ba34e442771a4d0296787fb0beaeebff7d
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10272 bytes
SHA-256: f04f37db5f58d689b3bfaad2df99c22cd9875ee85141ac627049bff8dadd8396
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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