Malicious PDF — malware analysis report

Static analysis result for SHA-256 51be9d0bcc53c081…

MALICIOUS

PDF

74.3 KB Created: 2021-08-23 13:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d43fa82ae7e8a27304dcd32c9bb2a3f2 SHA-1: 408130b115eecbe6bfd481fa2c2fda1262bee009 SHA-256: 51be9d0bcc53c0810b67b7d28849e542a75878e691622baf4a849b330d5dc1d1
184 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to host malicious content or redirect users. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the links and the detection indicate it likely exploits PDF vulnerabilities to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=geotechnical+manual+for+slopes PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/wofijejatebopigedurufo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/wutirudu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/bekemiwoxijaw.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/xoxikotakojataw.pdfPDF link annotation
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/97540108883.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/73573978715.pdfIn PDF document text
    • https://ienter.bg/files/25040799966.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/darataz.pdfIn PDF document text
    • http://poorclarescork.ie/images/namaralopokorijo.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/10333735807.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/cl2lg85qfng7egsc0lq113leg0/81785919379.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/74584588483.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1c4576e39bac0e402f4cdc4e4ced8525/tumeworopi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7bae06d19bdd0084cabb0be66b65645e/97241747165.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fojupixawasixapedaji.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/66911557217.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/30747358435.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gq47dlalm3uon07arr6mu1blis/nebobofago.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97365228888.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/gijevosovekajevusuparow.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/46551138957.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/21121306419.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/2055544489.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_off0000c09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10884 bytes
SHA-256: 07dd06662528a3b1445b83e0e2084b4a1738d0b1c2434cf33887e9de13e78928
font_02_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 16364 bytes
SHA-256: e48ef3ee183d02833077a449bb48710ae4e2374bc8ac11d2144cbef40f929a2b

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