Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57222d892b8491…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 18:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3702b3889db9b07ba4156cd2e4ef59c SHA-1: 2dc6cffd2e47aeed57df64a1a4aea73dc2a1c9e7 SHA-256: da57222d892b8491888cfdab01f24a47cb81ee5914f7b04cbca623070d8962f9
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 websites or domains designed for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of link farms on compromised CMS uploads and disposable hosting further supports this phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vinaktv.com/storage/ckfinder/files/74363469975.pdf In PDF document text
    • http://lulanjina.net/upload/files/levupijazunutuwotuzat.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tolorukuxufuxifatatoteb.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/48454575896.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/29olg85qt3o5faekbp3qt4e0mu/3730843969.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/ruzajevogowojula.pdfIn PDF document text
    • https://pcetravel.com/files/file/vutazekaduzupiwikepax.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/mifutu.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/vapaxomuvelamukirorajij.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/gogeluwazopudefew.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kabegulez.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b7aaf7116bff5f77472ea3697d3ee354/4184632997.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/72294350309.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xerokiratubafutanet.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/gikekiroxefefe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d4dc147a---zorewewidovanilezosawesa.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/vapewetotenafipodifelamer.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/11287160574.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/351d473becd0fea9b048acc8296321f0/63914518545.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/lanamonujopeza.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109011058408622.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/88402199738.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/zovife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=e+mail+als+pdf+speichern+androidPDF 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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10768 bytes
SHA-256: 4f1b52809587e32261da3225b29230ace0cff274fb64cfc5ac362da3a6644007
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 19672 bytes
SHA-256: 5359420296485e6fa5fdda9b5bad11e4e35b3ce473bf86e443c7269fa904a98e

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