Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b42e98a7054b5b…

MALICIOUS

PDF

93.4 KB Created: 2021-07-02 14:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5bbf5c772c43006c1233276d30644036 SHA-1: 180189ee74f841b5fd2334480b308c72f440c39d SHA-256: 18b42e98a7054b5b0f7666172d3fcacb7493310100fb3a2d01325b759dafda0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of multiple external URIs and a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fasaac.org/temp//files/nifiti.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/af043vgc29nqt9endi0dhip49l/zukezugenojovurojujose.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/geseli.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bacb83f9b7---9290364803.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/46dgkiu6dpkpbooir1dv7t6m1l/tuxagowe.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/seleg.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/piwowuxaxedibowinutuz.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/38701077375.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/57493866397.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502092020.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210625_794F6C6F8C1BCFB4.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/17856874041.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/71616982880.pdfIn PDF document text
    • http://sieuthibds.net/images/files/nolirupev.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c7f0c6ea04f7cc2e8aa39b830e4ec43b/wililifidanutezamowufip.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/23816445603.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/wagavubabafezoboborefe.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/aae9dab374d7e5fa7f5603ceef2e4ddf/10339620841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jurassic+world+alive+spoofing+android+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000142f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142F5 21308 bytes
SHA-256: 4fa06276e9c7c595add6dafe23bd22d6b4748d920aa91f8e0c9e44d6dd170dec
font_00_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 11180 bytes
SHA-256: 664c88674d312ed6692128083525739ce16d82eef273ede87e4cb3f1746beb9b
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 17712 bytes
SHA-256: edbb70ee471852eeaa6a922333a5a3806da8a8f31d9bf2063737b937f5220de4
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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