Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2d1dd7263a7d1…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 00:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ce042f1da256e90108b6a12dfc0f05a SHA-1: 8b08c444418075182c6fe3a787b2c1abfe4b04f0 SHA-256: 82b2d1dd7263a7d1b925fc95c896a868f2d128fae2c939cf63c8e919c8491c34
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malware or phishing content. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/28c4f61f88d9756244fc8282eee6fca4/65102907823.pdf In PDF document text
    • http://www.pacautomarketing.com/file/tarunovarafemorujupuwu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53353183176.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/72470251032.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/tudixokejovawakev.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/20341507852.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/poziwagafaxupixisujeja.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fekikajexepefewebadekof.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/54738752845.pdfIn PDF document text
    • https://profesa.net/userFilesfile/87021890949.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/zulavixukorepuva.pdfIn PDF document text
    • http://berbun.com/user_img/file/46190090449.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/73071850083.pdfIn PDF document text
    • http://innotack.com/userfiles/files/66674948381.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e120d50696---xolugevososit.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/tuwegusumadimiwixovaz.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nuwopurizosukotuvemato.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jokixegul.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/58288062470.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/78dbc2589dc8cc163abcbe5d9fd3dc53/8021893460.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/kexezililotufozu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_065855_9294.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209d418347---10594386033.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/wufufujowi.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/jetugapimiradixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=an+art+mediumPDF 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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 19200 bytes
SHA-256: 676e27dfa018a3956524a252a81fffc3edc11ad0fa1e42276c9434e954e560a9
font_02_sfnt_off0001437b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 10156 bytes
SHA-256: 4969bb1fb1884ba00f0dfb64885272fc9bdda2df0afc2c92011c5289814a54db