Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d993ff32f4ec45…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 13:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ef3aa5061bdcb424a1705a7e272633a SHA-1: 2619c7c4b0655144b7de0f136fcbc1aa7b0941af SHA-256: 43d993ff32f4ec4508321240af263452f9cd150bbd80f104a5d65fbffe7765a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to multiple suspicious URLs, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=pdf+extractor+apk PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b557b2f58---pofijunurulenakitovapisan.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/52141891898.pdfIn PDF document text
    • https://ekransamara.ru/files/75193347797.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/fanawusebilezipawis.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sapubixinega.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/65402335461.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jumati.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/begezap.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109042027401123.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/95531115197.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nolegewun.pdfIn PDF document text
    • https://mkontakt.com/dat/file/4118991190.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tobojip.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/862f2fdac2db4d1d817568fbed08768c/84293919307.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/timesede.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19190132473.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/jejusajojiko.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/51079688489.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/67033986531.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/guvakasel.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7c45ae1---bepetetisenuregavinif.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/tubigifakonafepafowetazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f435a389a---somupisakodukimogugox.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/19620173756.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_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 19932 bytes
SHA-256: f72f579b0dd42a90344733c439dfbe3ec52b4a88f8c8d8997612a30d27020af9
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 10400 bytes
SHA-256: 0593a32c361c3f9f2fc1bc68568ff9a41affc9f37fdd02820e95c31b0734a8f4

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