Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aab091895253aa3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 19:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3adc68e8f40ebb08bb8b8eda1c33c88 SHA-1: 6921c7c8bcc43c44ae4edf5cf12041bca9a68227 SHA-256: 0aab091895253aa3af4038d38dc67b2778a2e619f483865fc0296797d5bf2034
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites. Some of these sites are hosted on compromised WordPress uploads or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ngocvietbungalow.com/upload/files/69855794296.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a217daec7c---42732416519.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/49171514574.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i2n2nfgf97mii2e5vaf7jf4gvs/14171233999.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/12988331476.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/dokedoxofetazefudesupota.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/19365175766.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/99140859895.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/ruvinumivogimupugunuduve.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fudav.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/acmh1b7nro5quolv3p0i72871d/98550637004.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4087d6dd---gabolodezebenifofa.pdfIn PDF document text
    • http://agama-rc.com/upload/files/37937548988.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c6f14b9e68d0a93f89f636ecfebc8eb8/xibodelowifejezisug.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/wigifapoze.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jugovevesa.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/waligilikadikew.pdfIn PDF document text
    • http://baoveantam.info/upload/files/goxopatedo.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/desovonedegebofinuf.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/5069721996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vade+mecum+2019+download+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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10940 bytes
SHA-256: ca0bb6f63b3f3823863a43ba5aeede482433dab97d9eaccf3960332ae8733415
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 19116 bytes
SHA-256: a40c6c29e4f7db9e4550aea63928a7b21a24522d57bc8c7c532bcb8dfde8dcf1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1