Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b562fe7aae0934…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 19:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c9cb6bdf6cfc06da352e2068ff780fe SHA-1: 57e6a44be401c580883dffe2e94039e1517856d8 SHA-256: 53b562fe7aae0934c1e71686f02e1884cc6247e3fa3e21a2668775290ed19b0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were extracted, the presence of numerous external URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://michardardillier.com/ckfinder/userfiles/files/511140962.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7ul3a7pdqfl59amvla1b9rin4/zadugikugasamojopexifodu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/nifewefipemazawudomixepi.pdfIn PDF document text
    • https://digireg.ch/upload/60016750936.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/5090489526.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/lobalaradagodololupola.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561ff7c1f21ccf73f42701d5f05d4425/12511784829.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/tineb.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/44902178993.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/82130586899.pdfIn PDF document text
    • https://atl-50.com/files/file/momewafimemag.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabe2a4a2c---talegogezesix.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16126fddab27c3---77270314554.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/zuvimufiva.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mobusunefapomejelalas.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/xonizowowerutavujoz.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/mazedowegura.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2cb314d423a33a9383a1ea036a195378/sokagogelefobagoza.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7c817413e---gifipijexomuvifuzetobodaw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99246191033.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4bb43ddb996a62414779e0109dbdeada/99442904819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=monopoly+money+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10148 bytes
SHA-256: a26e0d343fbbb77c54292d327272980079d9300f885a694c7e429d2bd0062c4d
font_02_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 18484 bytes
SHA-256: 710e6e3f9b6294cd41045708f82f54ff6c4ee63816eee2ec02b2e76069480f20

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