Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d8c28d62599a40…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d13ffdf896ece51eb7abdf0730769f08 SHA-1: 38c70a6a8b83a758ec6c1eab7e1324b356283ac9 SHA-256: e4d8c28d62599a40643dfbf57d084f8d5762b22fb8acb482778301369f6504cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'PDF_URI' firings strongly suggest this malicious intent. ClamAV detection and ML classification further support the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=setting+up+a+group+text+on+android PDF link annotation
    • https://taxforce.nl/userfiles/files/fuzaxojizomeku.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/44426319404.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/poxavikatevuxenira.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/gokodaxepugolotime.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/30145278737.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6638e90e---60776869345.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e150f06a---domaj.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/7834391432.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/3313764594.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/88crjau0tku5ejvtl43vr75itr/77074398891.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/71042306527.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137983c789c1---50192736271.pdfIn PDF document text
    • http://normel.org/files/upload/file/zatetojasutudububenosuzun.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nudazafovebiruxugone.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/78629340642.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/10948858466.pdfIn PDF document text
    • https://avela.md/userfiles/file/nimojozajuvowowo.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/85542739755.pdfIn PDF document text
    • http://sksound.com/userfiles/file/dejeselopamadonokuremalaz.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/dunudufuwinevumeki.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/33598446695.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/366210938.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/94525275276.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/xoporefedoravemisojaj.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9d8154c201c0e8dbd8e43796706d0f4b/pobogoroselijuputipovak.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/dapuj.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_off0000b1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 10628 bytes
SHA-256: a703a63a464d41e690168f08b31fa4e8a8455544d19fd64b9f781e062964f6c6
font_01_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 14132 bytes
SHA-256: 2fe6d11ce87f784261f776e8f1c4dacdd087548fcf8b7a58cdafabaf1fa99cd5
font_02_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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