Malicious PDF — malware analysis report

Static analysis result for SHA-256 3331f6bff5919b6f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 02:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af672db5a7f887199748145a1c8e00b0 SHA-1: ed7e5df8e50a40ed22a41ca0b5b981b0a5264cb7 SHA-256: 3331f6bff5919b6fc3f8cb833c83df78e8384d0f411b18adcc8ef40bdbbdf169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. This indicates a phishing or redirection attempt, likely to lure users to malicious sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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://egokituz.eus/files/galeria/files/40169152306.pdf In PDF document text
    • http://chnli.tw/CKEdit/upload/files/10002570706.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa211ebc687---97150975346.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1f5708a1120479d1dc84480b9860dba4/88306719848.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3395b5a508255e5322bb9ded4c9d27e8/rotupexofimofuferivitemiv.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/64527319284.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/73531597689.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mafejuleperuwo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/mugavupijofezuzijur.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/94741416859.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e4175b22---98034718622.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/regufidomobusunajiwulido.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/35632730367.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/dananatubisija.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060310002341.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/97395729460.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/58866082827.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/28557f36ca2a62a1b017318833e5f639/bosaxajekapojerilixonezom.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/65446360615.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/68761075129.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zulitawiwilobadamilamam.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/48659420844.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/10298078883.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609537a006a38---12544927154.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bjgknik9ii3hpf7igenif54r89/85765734286.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ho1ddb5h6499ahvdd9elgjajh1/8056250490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mpsc+syllabus+pdf+in+marathiPDF 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 10980 bytes
SHA-256: d58fea791585fd159750080a348d384a41838d2c18e7dee831ffd9ffc6369abe
font_02_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 15044 bytes
SHA-256: 8e8e6e880a859c6853c3b35634e9bbb7f601f657871f559cfc1fdb1f1af1f51b

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