Malicious PDF — malware analysis report

Static analysis result for SHA-256 5897dcc6abd3fdbb…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 03:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 903e03afa449297a43a0513a876bb4b9 SHA-1: 4744d6be188b5b8985dcbbb5c571036cbf4c0094 SHA-256: 5897dcc6abd3fdbb4e48f249410d8f648b3a1cb80cf06f03dedb46087a21077e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external links. Several heuristics indicate that these links point to compromised websites and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict. The embedded JavaScript, while not directly executable in this context, is a common component in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://altaprecision.com/userfiles/file/jupazevajunepe.pdf In PDF document text
    • http://eternoohydro.com/d/files/vupopuvovonepu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vogetoji.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/ledukasirakusepafijuj.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/rakor.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/namukekezerafupilubafuf.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/94375425522.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/resulukibuvun.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378192a6627---62109611618.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wumomapowibixu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/ratisilebedajogepokekad.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/71820193531.pdfIn PDF document text
    • https://jjpremiers.com/files/39933722427.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/fegavuzemufo.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/53470181095.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/5486623021.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141027519656.pdfIn PDF document text
    • http://clerus.hu/files/file/resemulebuxalidi.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/selujinowuvixibagoj.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/5275996048.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/21479666176.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cf73d1c9475a7d3a52d8ebbac7f5e30/95800341678.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/32049042294.pdfIn PDF document text
    • https://matratva.in/userfiles/file/vupusevobefasedatasenidoj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/om5edqj3fnrcqv17elmfmoj42g/jolivugijumiwujifedazofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=scan+qr+code+apk+downloadPDF 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_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 10548 bytes
SHA-256: 2d1cefd3b4b473de488a9933a84c671a6c3b39bec0502bc27790400aab357c90
font_02_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 17616 bytes
SHA-256: 785f46d503c0f5bc3b69c4753e1d49b7843ad837ee038f91af6e4fe6197f5631

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