Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdddd96decb1eb4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 20:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25c126672e879863082a016492501bd8 SHA-1: 2459dee168ffa76c1fef20d28f1b32d42b5ed052 SHA-256: 1bdddd96decb1eb4fb80260f6fe4f96c9108062f9c419946c797cfeffc16bef2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://szalkasszorutacskok.hu/app/webroot/files/content/files/vumezedunatirelisijuvijip.pdf In PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bewapuparudibivir.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/24862537334.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/81903518482.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wetegogajetej.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tekeluzixidara.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cbd761ad---24397598292.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/tiwigaditukesizefadinoj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2a81c13a5ab6fce9b7e3423bd9e2703d/xegumagatul.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/42369062506.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bewizexe.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/jevezufaxuka.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/86919671119.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/gijunuxoz.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nisanuzomif.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuwufirekepuberovul.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/18626729880.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/dideridob.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rewiw.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/11861374019.pdfIn PDF document text
    • http://cycling-software.com/files/file/sowojesewibigovi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f621269e7f---79398256360.pdfIn PDF document text
    • http://belean.pl/userfiles/file/nojovikivofeziguzofov.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/peximupoxamuwawepapete.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/woxidiper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=play+store+download+windows+10+pcPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 17816 bytes
SHA-256: b5595996afa71101ad2c8ca24124ae12756426637f3aadaebf1a3e270a0aee50
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 10880 bytes
SHA-256: 28e096a0980149b0877b7ff72d05b53048bd500caa983422f7aad5cd9bad6733

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