Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecee097caf1fe44e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-18 23:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ec8477f818ddba4b9ad5fe380c9eba1 SHA-1: 69ccb6b80199016ad7b1a9a24d68546970c80c08 SHA-256: ecee097caf1fe44e1c0723bd22873fd9035fe2ad7d2bea50435c2e4f3f7b0b82
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, designed to direct users to external PDF files. This suggests a phishing or malware distribution scheme leveraging a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pvivk2mfcnu5mv3btl3or14l40/zoxikumi.pdf In PDF document text
    • https://ikima.fr/uploads/file/95819037954.pdfIn PDF document text
    • http://cy2hand.com/userfiles/nomidutaguzogomudijonogax.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d229cb06---tuxisavifat.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zibuwufitatako.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a61d94b396950c7d4883c05eb11f358e/pelebixovorekorap.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/68813187178.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/danuwumugik.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/86635109707.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d868562e324---50407576250.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/22487543367.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/62946976362.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/40720bc21f69ff9779993351c7e97699/93781452269.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/11114500656.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160de5bb826cf3---95286168635.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160896939a7816---suzavedoxubepe.pdfPDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c66b4f17761---sixunufavemukufodixe.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/32387295584.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/pugidirodino.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/82252073989.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8asjdrivul48an2mt2bnp49ajv/40461459890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grin+it+and+bear+itPDF 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10084 bytes
SHA-256: a17f4e51fc0dcfa56c7f319543e4e5ba54d3e37c75818e2682a3d0161ea21f03
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 17712 bytes
SHA-256: 017fedd117e92d38eed91c5f826ea702f64bdf7edabcc55f6a115c99436f8740
font_02_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1