Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb648e7cdec3b9e…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 10:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6fe1cb20c14dd29a661556ca50a3122 SHA-1: c6d4494d47ea811236854f428e6d687e58914b87 SHA-256: 9bb648e7cdec3b9e58f2e1c4c2cb13f0d340600e616b266a68c0de5d0a4e583c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=pf+withdrawal+form+10c+free+download+word+format PDF link annotation
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210619033133.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kuliza.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/53962892079.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kukewosigukavosivufoxizev.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/234f87cf011c404f96070bf6185e6389/32411958787.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a3ff8101f60aa3947516ee0083f36c55/gidejipit.pdfIn PDF document text
    • http://leton.pl/userfiles/file/61727977701.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749105d839b---23906641681.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c87faada1---31080769042.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39dad4068---64918655274.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/befapekixekesoni.pdfIn PDF document text
    • https://avela.md/userfiles/file/85057882466.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0f1fab6eef76c0b414aea32bc4cdf00/mavojif.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/76118535071.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/59126025852.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d2ctp5mbr7suttlmbcekm1gk00/munetofe.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608528300b96d---26321937663.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/webetulipojunop.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f795f0f8---93641548036.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/7549549847.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7604c49ad---52840850543.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e45b192ce---bowiso.pdfIn PDF document text
    • http://belst.by/upload/file/29662015335.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac3305c4e---71713343588.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 10832 bytes
SHA-256: 55bd984496411a95187661c84ba69f1634ef193d62278bfa2850df42ba6bf81f
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 17056 bytes
SHA-256: bd507bd083e0099708d9e2610bb763c70a09e64f627212591bf84e1b3cf5148d

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