Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c75acc38b53ebc…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 01:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 454e545c5423f1ea69ab41c88f070abb SHA-1: a51fc7d0ee984dd898bcb3375a5fc1706d94674b SHA-256: f7c75acc38b53ebc9641180414326281029e33e43b417215dd8fea8971320ac9
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://oniceh.ru/uplcv?utm_term=writing+linear+equations+in+slope+intercept+form+worksheet+with+answers PDF link annotation
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xesonobesudun.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/putevowezitonidane.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/gojawa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ee85a5dc---makusunezukija.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0298d05d---xumemukakad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3m93tmu9dniqjhu0qrf0bt3es9/65342611320.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16mico2p8ldg3qrdl9vkid8ba/8687466185.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tibafudo.pdfIn PDF document text
    • http://djpress.pl/Image/files/wojugiwunekiwalotixekef.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705b65dabed---fivuzosopinuzebum.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/lumeladiv.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/dutuzedesasowoxarewig.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/da8679cee6f182a5ddde4fbb231b2d5b/1752247900.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/rerixinowoluk.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/93417698630.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/76533604387.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/20992224061.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b95577cb820---fafixudomeresivalarajagi.pdfIn PDF document text
    • https://best-label.com/upload/files/tufixotezotugifebamixugux.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e98d799bf---49197732490.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/satajezipalalunabuleru.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/fuferogifudamokajisejixil.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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 16592 bytes
SHA-256: e367656c93ba1d976a829708501d539afd25ccbbdfb5972f5663c9adae1735b7
font_01_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 11344 bytes
SHA-256: 4e9ee0e8f95f82a80bd795dad8d40376995f5b9ada9a06132458c4b98541aab5

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