Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd0593613d265ee…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 19:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 299059f045cb3d3d6d5dd637efeb1229 SHA-1: 429bfacccf5b214677fa2e79b994b48333a7c841 SHA-256: ebd0593613d265ee8b44883a8e96c3537f06d188910866dbcae4e582cb66c00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300a8c64610---48403704973.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/098430dc47d0205c375245316f1679a1/lanaxevodadavelerukiz.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/35360042581.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/m88ukq8712mrjnbh5thm07k3i2/97761897687.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/zamazaledigajagefopitim.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/66587592768.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/10879197563.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/19649302138.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/vonujanepomodonopojot.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/19938432663.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/27255834459.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e021a7e239---6464977628.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/71039063151.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/97340772275.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/59020157102.pdfIn PDF document text
    • http://hbaoge.com/upload/files/85181343574.pdfIn PDF document text
    • https://hoongnau.com/upload/files/sitoxatu.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/rajunitegor.pdfIn PDF document text
    • http://elpijisystem.com/file/mipopa.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/tekuwikolonamo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tivoridikuwajidape.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zagagefojewo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/79219163266.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tilumobowitafadukut.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/86749523225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=faleemi+cloud+appPDF 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_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 10280 bytes
SHA-256: 876a0fc455632a9323a4c58195a1b7d1356682b8570a8db1466ae1a7801f4a99
font_01_sfnt_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 18032 bytes
SHA-256: ff464106a4e71c2416d2b9a9f75b930c9c988d3d53294d821a326d37013dcd56
font_02_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1