Malicious PDF — malware analysis report

Static analysis result for SHA-256 671929f43efaafc0…

MALICIOUS

PDF

74.3 KB Created: 2021-07-03 20:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3d3c79c3dde76dd7c86c2db6b7f27c SHA-1: 5412ef9f7b0455aec380a786bf7d65570910c451 SHA-256: 671929f43efaafc0f9ac21adaa0e0f7340e3c8ccef6db576e48cb8b09a6c6cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm heuristics indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://searchlink.org/userfiles//file/55050088634.pdf
    • http://araonline.hu/uploads/file/nejegozemewudozopom.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1e3e8b9d469de40286f4d7c126ddd300/xijafapuj.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e5f7da9006795a012a5ef0c7606c1a76/90559648255.pdf
    • http://ekotronic.eu/files/file/2245213541.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc8636ceb8---ruvoxotidun.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ad087d3364e10a85a8145c44551c06c7/pijonusenilewakege.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9f002965d8c942c6591ad11cedf406b4/73807492176.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j56lusrechktl8f2d29j3miidq/xokeda.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160970a957bc2a---wexawefavudazawitutenebuf.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bmptda60l3hmb7h8318s6bk9v5/zozif.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/guvaxizadajevewetufozoxim.pdf
    • http://dakmoto.cz/obrazky/file/vurogikewesi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ce6bffbb6dcbe7adb22d4ae2358a15bc/pituzukijukinufazatoz.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc05badfec---90654884553.pdf
    • http://andlupa.com/userfiles/file/wusamamunaruwa.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8i400euif8vmftfdhoocsr5ao5/82573679241.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d64cd42be18c4ee4819cbaed536d79d2/87759459039.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda9f55c6e---lumolixaxa.pdf
    • http://seoulsquare.com/userfiles/file/64347398701.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j7coalogs8hus0semhkk5dva32/68600795142.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983caf22197---72751966209.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=monsters+inc+stream
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e2.bin
054f8c3872f55d706d5815f5d0ceadbb36181a94ef4e08fb91d44625e2054bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E2 10336 bytes
font_01_sfnt_off0000d838.bin
1ebe6f95bbcaf88159c2a4769974b93f09b45cfb20fae11b34e4144aad4e3838
pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 17124 bytes
font_02_sfnt_off0001046e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes