Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e7dd0ce5c15e0f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 03:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55eb78adbe505b3d345027282be5381b SHA-1: 4aa703ea1c4ab58ed811550da85e72c4530698c5 SHA-256: a1e7dd0ce5c15e0fe172bd3fcdc4721e3b2022876440602864a885a65227f0d6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to other PDF files. Many of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a campaign to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://ewt.cz/res/file/najovurikuz.pdf In PDF document text
    • http://decorstore.eu/upload/file/fonopinaluzo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/798f658143fb50af0de3325ee03e7bdc/88383074825.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/3985722310.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613550f5e2fa1---23056738861.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e537b9381c---topujixanazajuta.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/zitufatukame.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78a6bf2be---41535498616.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/92239672550.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/40027112743.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigefobakagidizopezi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da99054afbf1ddc5ca12cd5955dabbd8/38022901455.pdfIn PDF document text
    • http://castel.lu/userfiles/files/35732725809.pdfIn PDF document text
    • https://huanghecables.com/d/files/87676438153.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/69403148670.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/33051579395.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/716c69bb740965c531a9312393b7ba2c/sotevidomepej.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/vixozixoxetixe.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/titigexagalimelitapagosor.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/xetisaxiv.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/ranaxirutegevavizi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/28222294219.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/kelevuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+great+math+mystery+answer+key+pdfPDF 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_off0000b6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C3 15216 bytes
SHA-256: 4517adde924d260d8d69528ef3fc506096e70970365884f33e57d0bbaa9d1074
font_01_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10944 bytes
SHA-256: facf06d3989a688ec9178c5fe5295f1b1c56b988722f0f47fa43b0f5c63523c6