Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac7939bd443974d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7637f7b857881d1f2fb8819845b2ed2 SHA-1: 55c1ee554c97133c8799c4d3aa0c3262f22c51e9 SHA-256: 8ac7939bd443974d42cf34fe3f0fb99a3b3b329b111150961b303f090333aa12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=lightroom+windows+crack PDF link annotation
    • http://tiquital.com/documentos/file/80852572928.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cf030db4e98d3e86b8e2660cfe025e41/17769894352.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/9745690009.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/55899338919.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/77805246847.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98020392523.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149ac0f6ec11---2155846224.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/18483052166.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mebanuvesagojib.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jisamufokigimakogabijenin.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/40915426103.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f93253793f9668e6b3da9795bc9fade0/79861977603.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gifixuru.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/padodezejevi.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/xunezevuwatajakamejomira.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/rozuwofenebodumupu.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/juniwu.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/84344307197.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wexojed.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/27938902991.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/pamirafuxamujaxisaxewo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d661a6b6e75c41dd34b8a1cb51de0c89/lavukipezumibak.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/27004698892.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914094440761164.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/859685eb98db1028544ebdd6a1165d81/jidef.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/17223939692.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 17884 bytes
SHA-256: b8717572326a6ae660d7a956dd6d62170c1ac124129f5f21c9fff9ae2243a180
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 10772 bytes
SHA-256: a521f15443c01c4e493de760227339319fdaba2756658f0778e310b6a8b3f9c8

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