Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f8a2e41672313d…

MALICIOUS

PDF

92.4 KB Created: 2021-07-02 03:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 750d2c803a708393f8df0ea52ce8b205 SHA-1: 1e5da849bab7e167fbbfd13423aa5bc66dab4b63 SHA-256: 67f8a2e41672313d447c8f3510baa2c9d713953156d2252d45dbfe43b3e26ac7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bestcoloringpages.com/userfiles/file/22717331518.pdf
    • http://amindoost.ir/images/upload/files/16321852017.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098438b6fea8---sejotebolokunov.pdf
    • https://luyenthitoeic.info/userfiles/file/xeravujifulupanof.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vrkmdjuhp6e61qoqjjgkapvha2/ponuruzujurozowidejo.pdf
    • https://ludifrance.fr/userfiles/file/97365148687.pdf
    • https://alutat.com/data/file/buxowujuwur.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/baa13e232d9315603e4bc6472c15582b/jugaraxilizog.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uegijcm3offh1j79v6qau8qvet/kosemerulu.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f51574e79a66dbcec53d8daec3725b7c/digozaba.pdf
    • http://dachastyle.com/userfiles/file/lufuzukusurotoram.pdf
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/4121124038.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/32072939833.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710b5492d---sajupaparuf.pdf
    • http://chiangmai-clean.com/user_img/files/liluz.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/859bffba5f646b7b32d84775e3e27011/65889949137.pdf
    • https://pima-alarms.rs/slicice/file/8900784911.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819d8e124ea---bokis.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/fetez.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a492892b076---29060417753.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nessa+and+chase+kissed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin
77838623a7fd0b9f4fdda102b476f74fa06e5097c250d0385a6fb06638205171
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 17580 bytes
font_01_sfnt_off00011f03.bin
6ec6ed613b8c29a76cecf6bb16a5f01a6d84df180e4c59826e44990d6fc1a322
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16576 bytes
font_02_sfnt_off00013584.bin
329f3e362146aa5b91996afe0cd76707d3611613de0f6e34fb5915bedc1f9bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 10172 bytes
font_03_sfnt_off00014c2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2F 16792 bytes