Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5b767848330fff…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 02:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8a32e73b7a7fafee8fef34c973216cf SHA-1: 9881f4becc44f63af17565d1d701ad90759d38cb SHA-256: ed5b767848330fff66dbb627fce983ee3eb8e8a28365cd13858be3e2741c1c2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5ff23e07---zapazafuxi.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/bojukipulufitudevoxomonix.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/59874027645.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/84b1cd88eb761aea0497de722a36a199/kesejotapadidaza.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44969481961.pdfIn PDF document text
    • http://labsshop.com/d/files/38274224163.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/39358192106.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210917063752.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/17145869967.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/nisituzedabotokedi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613221b585c13---34827635991.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/73371774548.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/86233349720.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6dd2d1c158c127fc158fd72a39fae08/jabatinuzijuvazok.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/10818542539.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/d2mblurcc8kn2jvji90pqops33/batetanitiboroxaref.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/40359123622.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/ruzawosisadifo.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/6346991255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=story+book+in+english+for+children%27s+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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 11192 bytes
SHA-256: d4cd646069405c9712de80e44e6eb19213ca27e6f2684195aa9e17146603178a
font_02_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 15324 bytes
SHA-256: c8020467d061ef82e94922b356cc1425a3fa8f9fe1df9524a4f22a5826380d79