Malicious PDF — malware analysis report

Static analysis result for SHA-256 b702bc12e81284d8…

MALICIOUS

PDF

91.9 KB Created: 2021-07-22 00:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a989d2de11476bf5a3773fed0795d2cb SHA-1: ca152566a0de6847e3cc79c69d2865ddd43f8fd4 SHA-256: b702bc12e81284d83b317bc5d70b740f6c67a179e863cae85fa7f61d1ea1cc97
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://acril.ru/ufiles/files/24741352651.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160956c315c121---vujimiwogiweb.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611cacf296---85153487460.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/mirijexisejoxavofug.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/56492854042.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uvlhis5cq3iv8tqaf35af90itu/jafabuberarejekezito.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/peferatiz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/81263233712.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nomidosafabedaj.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///18359167174.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d773782fa6---93210905612.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723008b7f6f---21710481012.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9902e2d448c8ae23d62e43c694a9df96/20923344629.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zokumonasal.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/fuwunewerokumasebik.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/12297824701.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1e650964---98567310776.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/biluzu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c7df3f---57359019901.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607904e9797ad---migesumikurinurejosilakem.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/satewisosusaminewesi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d331f5eaa3f---xowoj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d293d892318---23158424966.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/kozomeveputatovuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=parables+in+the+bible+and+their+meaning+pdfPDF 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_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 17736 bytes
SHA-256: 7a1fb8cabf6b1248af15d360479f13ec692d580e47dfbf1feea65efac277481e
font_01_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10968 bytes
SHA-256: 9633cf4556569d6d21018dc6f8a337c4a1933348d668340c797baa739004ec22
font_02_sfnt_off0001487a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1