Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde3f7e6a0e5944…

MALICIOUS

PDF

67.3 KB Created: 2021-09-30 11:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca41fcc79375292bc2b36515445a267d SHA-1: 62b839a7a5e6b950c87fafa97bdfb23745cc40a3 SHA-256: cdde3f7e6a0e59447f36f3f1c7ef0f01e70c5cf2515bf71df2c5d513c6bfa853
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-only design and clickable action triggers. It contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://bdblue.com/ckfinder/userfiles/files/renevelevagejowuviguwi.pdf In PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/302149641.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/79373800244.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/setagipodesa.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/80049916185.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/15602898168.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403450112ff---lukapusuxipogekid.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/rogudasomitebilu.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210901215237.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161522df014687---fujexejisivasijasodiwixu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/47818187492.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xulajovonudofewofejado.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/3249087539.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/fapezelemil.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613331d54bd86---38595078475.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/44500485943.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/93016127907.pdfIn PDF document text
    • https://sealskinz.ru/files/file/19431734761.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/42665748459.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/15325783133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=top+site+to+download+movies+for+freePDF 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_off0000ac4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 10776 bytes
SHA-256: 56af78af7b87efc2f651bcc4cc2d7dc302068cf1d2359db537d519f6aee892ad
font_02_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 13820 bytes
SHA-256: 5141345cb520f7c125ea4ac5f373928b0f4be7ef3c05a32801ba3cc65d68816a

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