Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1a47812be7f009…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c729c9dc25171e85b8c6885bf1478a02 SHA-1: 5f43953e604034e3d3bdd73c51c56534cb7e1c63 SHA-256: ce1a47812be7f00905b944ba50bd2cd733056ad7911ba8d7ecfc21639d11fd58
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests an attempt to lure users to malicious content or download further payloads. The primary attack pattern observed is the use of a link farm to distribute malicious URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=comparatives+and+superlatives+exercises+british+council+pdf PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bb81f3cce2f2aabc7dd234956ad28fc3/46422464602.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/duwadipoxidunamu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/xozurakupanajigujifajid.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/gapuzuvorex.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc0a6e87b---dewufidunumejidivikuziza.pdfIn PDF document text
    • https://ms2oke.com/contents/files/62780510755.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/22982939683.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wadawemikafugizuvonurosoj.pdfIn PDF document text
    • http://onelove.cz/file/44511085703.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e2bcb3026a2dfbc753c9c22be9e5ba76/mutesamizaso.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/66469420696.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xiwoxapodunitoj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7edee176---biwanofovudefo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/84255419628.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f85ac60fb---fedijedepogabivefozuba.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd857451e82---40440075969.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/93936491901.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/thllj5rh9h64keshtugaqns7o2/33819233189.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/13439209471.pdfIn PDF document text
    • http://ausafe.net/images/art/files/90262597617.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/618ef01f8862e173be885db5684f7cb7/lesevos.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607747ae08c8a---58130124060.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901091335.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/4def6hivs1ol0j3h3k18jft94v/62838256771.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ef76007b---bajizukuxuwezifijefotu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t50bsio58dl87dvpd78l7tmi51/934183386.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/776b70a06a16a6f155fb3b7a13a47cca/dudogisezugud.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_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 16384 bytes
SHA-256: 6c75263ad32fac8557b7f52c3b88700d50a1a6d2f63ff5b53bdf49e213d25271
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 11324 bytes
SHA-256: 413d6af928d7343de84ed218fdd35fe4b9855e5166efa098509cde7dcd1665af
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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