Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f57823423668cf…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 22:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c5440a630551407c28724cdb9eefadc0 SHA-1: bebf0c00dc88f0d4242fc5698810d9a43845a83f SHA-256: 47f57823423668cfbfbd7a1ad873e05f8c30b23ecbac7e7424cec8c1d88786b7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting for these links, suggesting a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=android+mailbox+einrichten PDF link annotation
    • https://muacash.com/webroot/img/files/jepisogigod.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/bitafe.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1779d0c22---79645517337.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/42673889701.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vijerupoguw.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8deb0f1f5---muxepitojug.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/19868313814.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/topukagemetibemafutej.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7a83401937ecff47d0d42a2c7ddf25e2/bijoruporewekonixitibe.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/kudanalaxadifij.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/91883982593.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/60752495779.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/mevoj.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/63419720922.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/50245926181.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/44620476857.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/pobagotaroxegoko.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/komigolik.pdfIn PDF document text
    • http://jcpingie.be/public/files/kolodewomefalafe.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46421505011.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/maligimaxibudosaparodigij.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/sovojefibopagekumurovew.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/rugos.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/9846624895.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/19003504009.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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10688 bytes
SHA-256: acd0bf9882b62b6390d99378db509d1574c3571d2522e05496d93900941b7145
font_01_sfnt_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16912 bytes
SHA-256: 0229e24a29b384a5804368831fa1e9642995e0c9ddea0417e393a4dc7e5e1525
font_02_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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