Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff4221b5af48a01…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 20:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57ba3a82319bf0268cac32e66b9e5fdb SHA-1: 928cc5a01ef003c9dbfc126d54df20af878b3ef9 SHA-256: eff4221b5af48a01b7c1aa22319a7ec61a149dc2208f7e36d91783f5f989bea6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/712eec9d6acbb890a11d1192357ad9bb/melelonarekatizod.pdf In PDF document text
    • https://coolinterier.sk/upload/files/tiwofabeka.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a9bd4fb18f1d14f0969a79d0dbd4a6fc/wajamominuwabi.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mujawenenas.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/31758345967.pdfIn PDF document text
    • http://poiskvod.ru/images/file/golibazupetinexavuti.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/11917447841.pdfIn PDF document text
    • http://ilkemymm.com/image/files/64981638293.pdfIn PDF document text
    • https://loctra.net/userfiles/file/betavepepo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609689cfe5bf0---walusup.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/75221857498.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/41904397537.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128d67005023---zedobe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611430e8873ea---1880175146.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/36417873404.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/50929860719.pdfIn PDF document text
    • http://masonhn.com/d/files/ditilote.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bivufunepeboraf.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/81955754537.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/76466272200.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/lunad.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5c90886cf998a5931d66a74f857a7bae/pifebusomege.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/meluxatetexox.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xixedibipokaxeludolizilow.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720e83edc5---jusem.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/35147261634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=microbiology+a+laboratory+manual+11th+edition+citationPDF 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 18804 bytes
SHA-256: b3b7d37fde32475279c2a85d143c7549866f94aa6d0765e83eae43289158a692
font_01_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 11048 bytes
SHA-256: 0d28327c6a2b4756c4ed74ab663f83dd5a65d98fae71121f4d59ba18b82c4c0e
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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