Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f407c00e0944e4…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 22:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245588194c25733d8d7bb143b369cae2 SHA-1: 35282cd95aac5eeb04d187c81f2cedc4c5e87789 SHA-256: e7f407c00e0944e4e80516d6db0fc23627e7d6dcfd6368933da31eba0e1858b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress uploads or disposable hosting. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further 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 0.9835

Heuristics 6

  • 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 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 http://rilta.net/userfiles/files/39443875269.pdf
    • http://4seasonstours.in/userfiles/file/newizozefalusonuwoxigufat.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f3f0ecd2---87430573275.pdf
    • http://animalscipublisher.com/files/upfiles/file/71133710118.pdf
    • http://amexeuro.com/an3_Uploads/file/22853707580.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804526a41c---wetevalefabibijaginowim.pdf
    • http://annabarons.lv/files/files/papuma.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f63285bba07f8feb89a77cadbafdee12/48290077897.pdf
    • https://elearning-chemistry.ro/userfiles/file/60309825917.pdf
    • http://musorcentrum.hu/files/article/file/60056525155.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3678dd845---zisigumijidawujukigiko.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59cfed35b9469c6c9441935495dde42e/tirexunovupato.pdf
    • http://ackerviewguesthouse.com/userfiles/file/51903601719.pdf
    • https://mdteam.se/ckfinder/userfiles/files/womifinedam.pdf
    • http://doreenindiatours.com/userfiles/file/48311233637.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f661bb4acf926b607b98e673ab0d65be/tokudurasunezigipiwat.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0d34c5f3---jakajewavorofuvovi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3ub41c44ume7unjv3qhk4re8oo/18850163618.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1b54c9922ad11f241266af3c7ed80490/19165330697.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/mvnikcpauri86he10vlqsv0i1d/65380504387.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/28019528667.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021620817367326.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7b2036c7---kubomekewutasida.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cjogcr12tqve9e6ac8or5tisc8/6288285430.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/55511967678.pdf
    • http://lws-realestate.com/userfiles/files/52146731034.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bloons+td5+temple+of+the+monkey+god
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7d.bin
10b256c547871c99e47808476180123338a3ca5e4bddf47307d8d194ab7a7e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10984 bytes
font_01_sfnt_off000108bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
font_02_sfnt_off000120cf.bin
92f9cee1b70520b66ae0a75501b260a1adfe0d7042a512086bc0a740d34408bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 17084 bytes