Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4cf9ead2337907…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 01:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69c7631dba0b2bdc43cb090371f28993 SHA-1: f0ebde844ac8d86b0459e2ecd8925c1cbd0d8bac SHA-256: 2a4cf9ead2337907eab3eed651b5ea8e2e6d736a0bebc24d4015c407100b8003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://marinda.ru/pics/images/file/53207292160.pdf In PDF document text
    • http://seamcc.com/UserFiles/files/45875394988.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/24773372462.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/82218588674.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326a7c28da3---48652512271.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a3ab7ded158b6a760e0181c3767a8052/45557391878.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/mekotezopolirojatorome.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/72785506710.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1qn2r9do8hm605a40412t2c0oq/70544915860.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/tijewufomawusux.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/texanoxudawalewatadokokok.pdfIn PDF document text
    • http://hanleyresources.com/images/63737073492.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/lebipuli.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jijifujudasokixamufupobi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/buzolumagetalojepavibor.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/70241313621.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/12762577995.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f75e642e---jatibi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312db43a453---14111745473.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/72619945055.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905062941.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/17258185389.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/44935037103.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/jatewemitenagelijubato.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/95152069457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mecool+m8s+pro+w+android+9PDF 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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 11032 bytes
SHA-256: c796ea9f28f6532bfd5faef87676514d3025e89e7f86eecbf4d658ad14dde25b
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16644 bytes
SHA-256: eda38bd3d24d80e6d931bf1c3859b9bc8f260127b214e1cc24b61b81ef0662b3