Malicious PDF — malware analysis report

Static analysis result for SHA-256 334f8914c6cc2714…

MALICIOUS

PDF

117.2 KB Created: 2021-08-08 04:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0061cd8ff6115c296a2ba4ed0c413301 SHA-1: 0c8fffed19c920f8e098f5cc32cf533d972019c8 SHA-256: 334f8914c6cc2714852f028c6d625cbb7f58733ba43513aae2a4dea0446e6e01
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://smidgel.ru/uplcv?utm_term=what+is+lifo+fifo+and+average+cost PDF link annotation
    • http://shinies.ru/img/lib/file/melirakubufozokavus.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6349ea8b---jujawipu.pdfIn PDF document text
    • http://www.bash.cl/media/file/63902232496.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/6325869342.pdfIn PDF document text
    • http://cpils.com/userfiles/file/10599513429.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/6cnar33hbnsuc37a7laphoarrb/57693211360.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/53685903273.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610652395f81e---76218484249.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/58629862863.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34548742717.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/86023b4c49e4eac225a4ccdae0c610bc/zenigajixerovoxe.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc3e90354---zumufedesajetimexofu.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/bozamifimejatexe.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060818370873499.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/73749914704.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/611b78104f001fff5f15f495a0496094/bisadoweratakekowaxugifi.pdfIn PDF document text
    • http://come2menorca.com/images/file/vukog.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081811eb401a---79205444568.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xinidakifimugugat.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210805_03744E69DB716213.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mikodurujukit.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/87286091132.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hrkn8i82j7hudbq6h2bh1bues6/pirazotozug.pdfIn PDF document text
    • 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_off000161c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C2 18688 bytes
SHA-256: ceae7dd938c647ba923e634cc643ee259496df48142e325c55bd9bf23c9dd36c
font_01_sfnt_off00019364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7B 10816 bytes
SHA-256: 041117dd9c30ae67a965e4984ad6b984ae2853235d074f09f7f1e507579340c8

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