Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa397a7e5ca7b83a…

MALICIOUS

PDF

82.8 KB Created: 2021-07-04 11:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38c336a6748be8907ed82ca6785b67df SHA-1: 61c748ee9d6cae1f81f571991afa46dd8f02e5ed SHA-256: aa397a7e5ca7b83a6f02800c822d93873ab322f681e94dc129b9777fcda4d6ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=trivia+questions+for+5th+graders+with+answers
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/50nqvb6ssjh83dp1cud52eaojr/5068530308.pdf
    • https://lacaune.hu/userfiles/file/wuxajavatotojot.pdf
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/nokifajurivolik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae851cda9d---nelesunonupemasaketo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeab8ace80---widejetasugojarov.pdf
    • https://easypayindia.in/userfiles/file/6805348557.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/bdu8j1h13051rbope7ivtvr4aa/29227371383.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9501e906b---13813401769.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90e91c7d156cc6e3cc4d88159ec02730/zelivamevij.pdf
    • http://wawa757.com/uploads/files/lemuzuje.pdf
    • http://aygroupmuh.com/image/files/40479812177.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e61fc577c5d027519d774e94c944bc14/73200952715.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6d5e58baad17535c783f5c7f0376680a/60800437124.pdf
    • http://alexlunacoach.com/img/editor/file/vusajuvexigodi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609882e8f35ff---ledebesixu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2e248ee060d62e9f58eaec56cf0fe788/17653424903.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6d03f2ef45da2fe3da1cc11d370eef57/xoduripaguveduxegakisiz.pdf
    • http://giaoducvietnamtv.com/images/ckeditor/files/tugij.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c950b33897---68037193097.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c1c6076c9330a7e2f065413bd2404aa1/binanagiwapobuxejop.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957a6942b1---gamoso.pdf
    • http://stark-tools.ru/images/uploaded/venonunejulofuxuluximow.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b260da72013---73061241278.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160861be1c4bd7---sokanesijuvurugoli.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/xidix.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec5857ab1---17796485674.pdf
    • 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_off0000de07.bin
8677afebcd6ce37e687f7547135d72515c83606281512c0ee0f6e8d444cec262		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 11084 bytes
font_01_sfnt_off0000f76f.bin
2fda1ff03fee6ad57059227074d2d369d90b00c1be4e9b6388c27aa9b8772a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17688 bytes
font_02_sfnt_off00012559.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 16792 bytes

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