Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b66cb46578c2b6…

MALICIOUS

PDF

86.1 KB Created: 2021-07-08 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bee68a65410c3c002cc673ad35eca1b SHA-1: 3f6a12323e454116f2cd13be50dba2c20adb4ed2 SHA-256: 98b66cb46578c2b61128e45826d5f5c42db66bd2d1f0bc827cf1df0a25e08616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for JavaScript execution or direct download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de91b17ac7---76706545414.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dd3f328c4fdc0f21af19e16b80d441ec/rabanopobatubujunezumera.pdf
    • http://nguoigiupviec99.com/webroot/img/files/35824337007.pdf
    • https://mmoxx.mn/userfiles/files/42715207965.pdf
    • http://dieta-plus.pl/userfiles/file/68534552860.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/hvmq15air8rbirr1m3dh8svk8c/lupexeguwizogapa.pdf
    • http://luisacortesearchitetto.it/userfiles/files/36426573306.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tnl7i6ogjcuqj4ecu0f2ehf185/lipidilolajidavurajaru.pdf
    • http://zabradli-znerezu.cz/userfiles/file/95550663327.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/db68dabab147718daa48b9d53e3fccf4/72714037827.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/xaligusaku.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ea23884ac---30664133014.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77c33d09---kexupovit.pdf
    • http://goodtraefarm.com/ckupload/files/25428068333.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160710dda1b0c0---13585492968.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8716100a---nosidizopikejolefa.pdf
    • https://hirurgija.me//files/fokuvodunejepazepe.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/87247067182.pdf
    • https://an-professional.ru/img/files/file/nowubalesavewixosefuxisi.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/516c2df402e465e9def086ab7d8edc69/resolufe.pdf
    • http://magooferta.pl/uploads/fck/file/wemivif.pdf
    • http://cuatro-pr.org/sites/default/files/file/55260536225.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e5353c7b4c4594f4653e4712c388206a/xadile.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9hqp1c4osmvlve5p2et7drqp5g/15257965349.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=trigonometry+with+non+right+angled+triangles
    • 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_off0000ec7d.bin
295730d54bb7743a41cf5f567da466062d2a6a9bcbd5d547042392015858decb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 17380 bytes
font_01_sfnt_off00011a23.bin
807acafb57b0933edd83ed620d788531b91d499dd5d77848328c5cb4d5c203e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 10860 bytes
font_02_sfnt_off000132dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 16792 bytes