Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abdb9425d2df13d…

MALICIOUS

PDF

95.9 KB Created: 2021-08-02 07:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef17b59e073c026ab765abcea6805db5 SHA-1: cd6f5f21fcf887e64190b728fcbea8b62a230df3 SHA-256: 1abdb9425d2df13d0dda4f76a6ee52b23deefe41645879bf788dded1ed0525ae
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains an embedded JavaScript stream and multiple links to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The heuristics indicate lures for clipboard command execution and password-protected archives, commonly used to bypass security scans. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9991052d5a0ab7b4c15065bfa89c6e74/momime.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c01f880f5---25000890169.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9e6c82cff893278e331aceed0267008c/76519115787.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/20294157264.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160855c5ba33ac---83215697153.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6052564dad23e8ef672ac6c9a6ac10bc/27878494440.pdfIn PDF document text
    • http://industrialdevices.in/uploads/bumigufijej.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/53028280245.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/095c00981fca56f7aa935e46460f102d/55053598302.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6262c1b045---tevumalevizukivu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c866b5a9---47558425794.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb018edcca4---gerezomufikafufux.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/17494738755.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/11704600942.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/76723665290.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/liwupatifezumupatuf.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7f8c46d96d9928a99f9de0edb76e6721/wobitonesuwanubefap.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n7p9qockpvkmmbagvuf5tugm9k/47323623940.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/bd248cd3ee856967ced6690fea49b332/xariwokejidema.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/dunomumixumasinifowanisim.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tikaxavokojigikuvetop.pdfIn PDF document text
    • http://sro52.ru/uploads/files/10635875226.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f262b91c4---92712665308.pdfIn PDF document text
    • http://ruihuitax.com/files/file/201667657.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/3655754965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mac+os+x+google+software+update+uninstallPDF 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_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 17328 bytes
SHA-256: 6f17c8254f542430449a4b8103384133e9c47e21cf1f42e3080829611a75377a
font_01_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 11076 bytes
SHA-256: 49e233a350985a5a20ed5a23ed2d2614b4bc07ade45c7863fb6629a0cc6c8b57
font_02_sfnt_off00015926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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