Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e34ae8c770ad747…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad4b9590f4a6f71104ec98f9c6d97e56 SHA-1: fd569b424be51a81ee0930bdede999af5a21e128 SHA-256: 4e34ae8c770ad7475c9107bbbcb44bcf40283668c50c3ab0241a5329a306bfbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=que+es+play+store+para+android PDF link annotation
    • http://happy-land.hu/editor_up/dupozizutuguxakafodedi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/sigowibiwajegerubasapogi.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kemurajefik.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/xexojuzomanejuzebaso.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/99004651443.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/fifaxunowiwudeti.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/43145634336.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m3iqle5b0uf2joisj2lqlja1co/1709238970.pdfIn PDF document text
    • https://sitarasign.ir/data/file/xisegun.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/79437772371.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f987c880e6b8912009ba0179ab476c31/wufeponoxulanetipa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010c8362c8---7772588166.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gobolagutem.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/62011944716.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/65982086056.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/95209556243.pdfIn PDF document text
    • https://gameclub.by/uploads/files/mupafa.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jomir.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134407392861---nopozesexiwajobala.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kemaluduselapulap.pdfIn PDF document text
    • http://vaithun.net/upload/files/wewesazokuxemulagi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/todagabofajapuxopixowo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fabazelamezanosij.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_off0000dc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 18080 bytes
SHA-256: aa32e41cd04c41a776bac288a3eb15a3c8e4cc19a1982daa45809168df493a18
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10660 bytes
SHA-256: 3d2469b407143c93432ce3df81462eb55f132ac5422431f4dba84b7fe1339b0b
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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