Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5897217c959b80…

MALICIOUS

PDF

89.4 KB Created: 2021-09-08 06:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bef1a0b7a0d796f4d32ce33f18729fd SHA-1: 6c8fbc11cd5555175d79c518dd4423bc9569766b SHA-256: be5897217c959b8074306e93d3f2caee9f220955b8ed8d7b66b1b26ee60ac282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alexandercdg.com/clients/36029/File/pasetuvasirej.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8dba9b0f65232d16e929a686e7b47a47/vuvugilufa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7f2256b3d8c580b607547d95267089ec/tukekovuvusaluxalugowuto.pdfIn PDF document text
    • https://togeltop.net/contents/files/pimutuvodizejepanuxunotuf.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/8787219449.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/36124622296.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuhs783851ured3ajbf39bv4p6/13367206936.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/25585695.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfdb71766---34018932748.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tivofefedazinavop.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/mifiwum.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/datunejelijadagigen.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/44599007458.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gilirimexavo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tg5so51n2v7opnugo1l99fp85u/77131168543.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/64898098088.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1t466ajkhumv6i83enktbbp63/mitidawijobekuxifidu.pdfIn PDF document text
    • http://weingut-suppan.at/files/wivunupudimizedositade.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/83430334875.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/tamomoxanezipozufigesop.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/wotuwawuf.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377049a7bb7---76323640720.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/wevutogubevorevuner.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/30c48a69e2b58defdfbd6fc7aa69b8a1/85895053093.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364299d545---3740729022.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nadebolipajibubit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=freakonomics+pdf+levittPDF 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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10916 bytes
SHA-256: 57f9c724579dc85b272658ecf39d99113c62666c302c66dec5c78be0aadca2ab
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 19284 bytes
SHA-256: dbcdb1b767dc18832e97ed521ef5d167f257d33ccadff50f174202f5fc8d2e1b
font_02_sfnt_off0001405e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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