Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b785ee0e9ca017…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 15:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ea50505d6a8da8ab709316cbddd0887 SHA-1: d9f543cd6beb582543153d39044507aaab3b7485 SHA-256: e2b785ee0e9ca017a4767a0338a140c9de1d89ef07d547a2fcc0e6600698d989
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rilbmfc87epf01e1ja5p7u6fl3/53489692151.pdf In PDF document text
    • http://vkts.se/userfiles/file/42184587510.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161356de0dbea0---81039151194.pdfIn PDF document text
    • http://learningkey.org/userfiles/jekakekizawarogowokusaxa.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/8481852762.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/29915834580.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267bb3519c---62434855283.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/57683471678.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/57759727522.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/jopemev.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614162058da89---90975926677.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lazan.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/62878229632.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/sojuwifexizasijo.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/63017077481.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dakifubuzaze.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/75000455109.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kekujogizob.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/34181715256.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/19826270520.pdfIn PDF document text
    • https://istanajp.com/contents/files/kunonavewexasipopalovane.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jodesumegaguxubapovixagu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1241235bd137dde8c9d284301d3076d0/vuwasoduxakizoder.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/viwifabosajoparobuxu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff88ca1d03---37845474748.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/91952253358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+see+hidden+apps+in+mi+phonePDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 18388 bytes
SHA-256: f961c26a932edd89c08168a4403737f3c98494909948853750b499c5fe76cdfb
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 10588 bytes
SHA-256: bbaa57f46def6572232aee2638c7098796639324e75c18998cc1422939e2176c

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