Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17721b4815838fe…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 05:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dded4042f268d5872266b92e09b5ea47 SHA-1: bef4060fa560a6ef67e14eaeda9fcbaf52265fbd SHA-256: c17721b4815838fe39d4f2a7bd355f7e47d989a71b068e4744fc060c8467ef5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to phishing or malware distribution sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gardens-spa.com/user_pict/file/tojosikiwefukonatitubure.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/28134647035.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/merinabuleluzere.pdfIn PDF document text
    • http://livestocktool.com/d/files/wizurosesijevu.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/94117886114.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abec04c880a.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/kenabutele.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1691a717---28721067475.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8fc115848b40f9061c9d01c14dc7371c/65133949861.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16676443267.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/68492921855.pdfIn PDF document text
    • http://amajyuku.com/files/files/96443532981.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9c63ed3af---gofebakodin.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d22474825078c53940b6cd2fecdfe694/60205178927.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1f50472ec69d14d214eddf9d2b014dd0/fakige.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/oj8frd1ceg92rnv959lat435sb/9902414356.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0531662c312af626e4f8fe63ca0e98c7/pozisonagojovoz.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d345d3f26d---11573071820.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/d8963usdpi35chb0117ec6qe7u/vijulalajewaxekiniw.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/7695727023.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/18500305906.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/kawivariligujavoxibikovu.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tesafug.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d54f8ab01---zagawobevilogojogawup.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8a4e1fdb---fogukizepawaxitupufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fuel+combustion+and+steam+generation+pdfPDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 17316 bytes
SHA-256: 19ea6ca3ceca63c1d5ad4c1bac0b8f511316e02b1a33b223b524240daaea75cf
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 11180 bytes
SHA-256: cf4c3b5eca17275a3595c949ff7fdf0400b5cf20a017540282133701be490dc9

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