Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc842484936829…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 13:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a46a4f1361c93b9174c8471641fbb505 SHA-1: e3962e86ab44f82d724b192223298d2cb7166373 SHA-256: dbcc842484936829a887af474042850cd3f5c9d73c3ce1f740f33988fef07820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document's structure and URL patterns suggest it's designed to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4ur9hj8fbpqd0h0dl9kjfh5tu8/43004570426.pdf In PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/pimanukalolejefod.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/33484528246.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/2452866710.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tmm10i2a11hlhj46l93ikvdg77/rekunaxa.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fujiritapifipagafu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331a83ded0d---newamopupe.pdfIn PDF document text
    • http://www.centralperdana.com/file/81503072870.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4f747af96dc8077ced09b9b88e4bd468/16082842144.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/18746257677.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130594a79b98---vegupemamifibiputoki.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/57921437189.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/82480006919.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6ba9930c---dolejugujaririkewomapawex.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/75551140232.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/selak.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e60af493---35242730610.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/polefureni.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/senedinixij.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/40816051943.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/rogevibekejun.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/vepak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=iphone+12+mini+price+bdPDF link annotation
    • 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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 18136 bytes
SHA-256: beb6ba1480f38cc4ad454c7b807e3743686c442fa9b729bba8b03a62a467f99a
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 10568 bytes
SHA-256: 10e02eb737959118640d5c1de7ed12fe61354273d51c257ecea7394ad2fc0687

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