Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5d207db62a4537…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 04:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20e294f53e776004cf7f789eb01a6921 SHA-1: dc1b40bba9e165d1c0bda346eee28ee933dfa34f SHA-256: 6d5d207db62a4537af75770beb64233b86a708052c3ddfc5f5a84ac7e7adebed
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a URL that appears to be a lure for downloading potentially unwanted software. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=iron+man+3+mod+apk+download PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0195aa7e---17724354918.pdfIn PDF document text
    • https://kawanmto.com/contents/files/repatexejesesazenepar.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/todobezopete.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/10947856797.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/95708296655.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/fitoxaxipumipiwored.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/54520365839.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161324f5ebad1c---40318891348.pdfIn PDF document text
    • http://otczenacts.com/media/files/dirazububejidesujofinone.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906051045.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/26191693690.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/87402793406.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/26081793593.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109051853535400.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/zojiseto.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/13272138861.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/lerozipolidol.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e34a97bde59553d92edec286b6f42f2/22640581263.pdfIn PDF document text
    • https://terracell.info/images/file/jezixegulofenunivovo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9bjvgld70dq93ms8ecvnsn9an9/xonokog.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rokesiperanuxefan.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/gawunuvetamo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908182022.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2d39c3ce---datazatajigonujokuked.pdfIn PDF document text
    • 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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 10364 bytes
SHA-256: 0e022cc3c7ae99ea5cf08b21587a62eec91d621790c8f0380e59f22a823bc865
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 19440 bytes
SHA-256: e3b78e1e4e08c26c3f0f7b4fd507029fe603b2989002f0a3183ac6ad183d4fb9
font_02_sfnt_off00013602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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