Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dddc474fd13da6f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 10:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f274f5aa04cda5de4c369f731dd2a19 SHA-1: 502616c9f606f8fcfc7adc2ab23ec84a732281f7 SHA-256: 8dddc474fd13da6fb845d0d0f0f508dbe03a57389e35a504e0ccc1c2b0a6028d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a link farm, with many URLs pointing to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=gta+3+playstation+2+cheats PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ad64a0da---67235627578.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/wolumufufavukabelamu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/087c748425831c8681bda7e8e8775016/78999872856.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/44173645285.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/potewi.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/luvubitedevepolagidijimex.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jederi.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/biretexunaw.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/71765760302.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokusow.pdfIn PDF document text
    • http://c-amc.com/upload/files/legivazetesidetavuwele.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/89303251269.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/91688422836.pdfIn PDF document text
    • http://grandfiltr.com/files/file/sutejebafumegurizusudud.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/negozib.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/31515446391.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/14276745901.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/63052105280.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/fokafoxelirif.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/situdotosapet.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/toxetarogovodolevo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/88609496553.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416409b4847---videmokofugipijonitekine.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/61871856050.pdfIn PDF document text
    • http://computerdoki.hu/user/file/36748533580.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/genogajudabibagik.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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 10816 bytes
SHA-256: 7eb39d359745731262d5ff99c559bc4cbb36aad6962b82325edee43c92574e0e
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 18760 bytes
SHA-256: 508f6b47e8ac7be6af797c7d78dd6532178ba7e288e3f334957744d5035383b2
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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