Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b43c3ce90d83b4c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ea15925f80f9ec47b16d0a566d05cc5 SHA-1: db914b6f9c4c32631e3d20987e26477a3dfe57dd SHA-256: 0b43c3ce90d83b4c58c2e649ab1200def918e7090f7a94154f86759283d44112
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, several of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms detection as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=formulario+ser+bachiller+2018+pdf PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085a2072eb3b---1583396696.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/73847027311.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/lepofovekobomu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/10bjhu0k1ktnmgbkf22k9ko61l/90328741385.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/64136956663.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/35337714996.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ecb76a54---verelojabisujasedi.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/91297253665.pdfIn PDF document text
    • http://aimic.com/userfiles/file/salar.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/26521305773.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wopekagawoneputalovo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/54574918533.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987faecd97f---lejivejopamavuv.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210625014448_shlnff.pdfIn PDF document text
    • https://koratspring.com/upload/file/wezozazusajevof.pdfIn PDF document text
    • https://ahha.az/userfiles/file/senatozi.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/26463817079.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/66654149873.pdfIn PDF document text
    • https://service-panev.com/userfiles/78348963315.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105fbbc2b58f---lunovutofu.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/73408932895.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/wopidadezuruwejataxa.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/47423913658.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/40007886588.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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 19048 bytes
SHA-256: 17c7c3fcae8926b937713d853075c65b33de74562913969e2d7844c3a9a271bf
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 11404 bytes
SHA-256: 45c1e59687cfcefa63ea1b1fcc57c94c88c56ee144e8cae5f0c050e6ce525188

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