Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c32be51a12c5886…

MALICIOUS

PDF

70.6 KB Created: 2021-09-07 06:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f3d415e6e87dcbe4e6dfceff120ac1e SHA-1: 55f92a2b51b2bb55cfdc9fc3706be693c0fcac8a SHA-256: 8c32be51a12c588659c688a68b1f9919d9c8f8d4bd2fa5de1813f46f6f7d141b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b63944c3458---vadabifuzesupeburukibani.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0be37816d---87456162223.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/44094201585.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c46ada596ce398fc1e8d577202734ba7/18223723755.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c6a6f97b9e54555dc6e57ad04786ebe/jetimogodoxekozopajabase.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/5ef8d51bc6ee4522d8608cf3379f79bf/lorazapiraviginitujev.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b59ca6af93d3118d2f8eab3a27c1dd82/98196371817.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3371a00f54---89267325312.pdfIn PDF document text
    • https://jin-ji.com/upload/files/84567158051.pdfIn PDF document text
    • https://wildnaturetravel.com/File/xefimojumopodogipujisalez.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/beserawitabipekazuma.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/6867613784.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773d2dcaf0b---bivalanisoju.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/12611134245.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/lodosujafuvibejumupitu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8994c07470d50bd3d8a7b0464b1b2a68/famogefofafopojazufo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cdd0f1a72f93091450b2b6862bf5ecc1/48540017519.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/44749618287.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/xujaligopasojasiped.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c816786328b961c414aca1c63350ad41/55588340903.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15283a4c8---xuzabupadured.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/85de69288d47abd079648e620fb611dc/mezupexojixasivuwod.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/zogosijeduvorugoj.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/89752494802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chromosomes+genes+and+dna+pdfPDF 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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 10740 bytes
SHA-256: e6647ce7d925806f69608dd4f320d6dbdb2840351bd24a092a7fdaa19d98b4b3
font_02_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 14524 bytes
SHA-256: f7e02a357c5604fcfdab12bd55864b132352a727c9dfdc3c5542a893c820faf5

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