Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c0ecddc3eed3c5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 03:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f36c95c3b2bc4278d73787d8953c6237 SHA-1: 21a31d07d88ba118e6619a442f39665c4efea549 SHA-256: 61c0ecddc3eed3c53e8e7a488eb9db343657235509bde828e07c36839436a26f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a phishing or social engineering attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=deewar+2004+full+movie+download+filmywap PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613009935a55c---65941061390.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/kokob.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/37159201540.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/18903391795.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/24298358246.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/76982165976.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/fisududutepaligelog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442e271d1ac---xobazabogov.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/befonudanef.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/kopujovivugidapofuxemez.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xuxatojedakakusinuje.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b24b76eab6d3cef4aaeb4c6da51e48d0/mebasotukidolobuwure.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tefekexafigokuzof.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452dfb58e99---fisozujupusivuxudasav.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/gedegizusifufafo.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zufom.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/51736159694.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161343f51e0018---xukoruputomawud.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/21068233729.pdfIn PDF document text
    • https://12shio1.com/contents/files/45087461024.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/77415839866.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/pexigivulixarowal.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/57c107883490066bbd471603360aa457/71299607866.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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 17336 bytes
SHA-256: 2f9330c192c2078b2f3d1b65cc1a1e39c5d6f52978f2db6971b868fb5954de5e
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 11080 bytes
SHA-256: 2159f9644ce660df2c1dbd9b96dc305b19d3fa3128b6f9de398adca2d9da46ee

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