Malicious PDF — malware analysis report

Static analysis result for SHA-256 346c25f181ea7a3a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 06:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 885d8432fc1eb66ac4d4f42b4b8efa3f SHA-1: b8edb21c99ddb5e50abe8d82b0e5cc839767e3f4 SHA-256: 346c25f181ea7a3a07f19c4a608f975393177734e91a74057a6c1b9af24ea92e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=annie+on+my+mind+ebook+download PDF link annotation
    • http://udokutscher.de/gfx/userfiles/files/dezagajodidozavudisedij.pdfIn PDF document text
    • http://bresky.cz/res/file/88711426762.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7551b3371fcea3a9b84db59cdb0732ea/voxelab.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/tuvibidepigubozapi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pexurenetekaladajikudo.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/biwogu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/vujexikodigigef.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/79227798253.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///virajajoginulagowigifefa.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/45798451795.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/72160232523.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/difoluveromosiw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddd2d4248---juxukesewejikevim.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/91268911577.pdfIn PDF document text
    • http://gapp.fr/medias/files/82052059576.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfd7120d8---jobakaxawumup.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/26277961447.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/914829645.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109060834267501.pdfIn PDF document text
    • https://mcsfood.com/images/file/34809342279.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sijegivepikol.pdfIn PDF document text
    • 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_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10456 bytes
SHA-256: a70903ae6698a320bcd110a96b54974911a37d8bbce4cc15bca8fba1a017861a
font_02_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 16696 bytes
SHA-256: fdf414c6b7f5342aabc893ceedea85e2feca16b0e957c019f4663518dc5cf283

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