Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7c10032314a0e7…

MALICIOUS

PDF

98.1 KB Created: 2021-07-25 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e39f3dc81cdadc1a77a739c760baedf1 SHA-1: 5c7d4f34acfe1abb243d2565e1b6c1a52461122b SHA-256: 4b7c10032314a0e7cc75f12dcddd99fa3ff877d37ad8a9d502c0409f67800087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5ae4abe9---vopakeboruxetiwixuw.pdf In PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/narisumojajoxexeginof.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/15682252826.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a28f2f58---33536540353.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146678d461---rovadefasamaxeberofoj.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-31/20210531210129500531.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/80120475531.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/lezikudunelopuxatal.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d9911835652ec4c5957528b7f418267c/76600302469.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3749499---supukekawodove.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195a25ff52---47301731526.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210719124915.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/paselon.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ahksofv403d3sn6klrt5vag405/92159579515.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cefc147cf---karulogukewibu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/dc6feb19bafae46b992eb6dd4c53e436/gixixonabet.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f9d64095e51e1d292afffc831981c9e3/numugezesowedabi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/wevosujoforisadoperat.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xukapetepudapedum.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f908e133ba5f10058a2207f9a9f118d2/1551034520.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/noduduwififaguzuwakijuliz.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8d88f339---51519015749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+ernie+hudson+and+clifton+powell+brothers+in+real+lifePDF link annotation
    • 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_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 10996 bytes
SHA-256: 4edd76bc7b44bfb082022e71735cdb31e80275ae251d82b6af0bae05f21dcadc
font_01_sfnt_off000132cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 17896 bytes
SHA-256: 741f2932b7b2ea8d27cdd5ecb1f813be0bd87714b54e8a8e56e3e5770dcbd496

Open this report in the interactive analyzer, or submit your own file for analysis.