Malicious PDF — malware analysis report

Static analysis result for SHA-256 590bfc31b259eb8b…

MALICIOUS

PDF

105.0 KB Created: 2021-08-02 12:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d72044dfac2fa2d72a14748a32e6d856 SHA-1: 4dccf0a2bfb32fc2f1e96f59e82c94ed789a1876 SHA-256: 590bfc31b259eb8b906a2e193fea0f03734e021442c219880ff49ffb8420b641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised WordPress installations used for hosting files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the embedded URLs and heuristic firings point to a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://odnoklassniki-files.ru/images/uploads/files/51067155498.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcb72e1d1---favomezosikiw.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/52875866150.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/824c9d40d911bd73e296fbe3cd772951/xupafafijewufubidad.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3307b4082---58743303801.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eb1b8da8d---70962733170.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950758cae1---15233666246.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072567f8ed63---44318843131.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/10581955789.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dc9825717d9dbc931247b796c1d657c2/32130416066.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202107260249204893.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6543fc40d19006805b94c5f1a8a0c3e4/jaxoxarusujisotulazurawu.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wideganepu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/81699187587.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/076ea43079e4768a045353cc98149e28/3649292119.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/332225214.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/nukevovik.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb805ae7b2f---98274437893.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/64044925825.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///27569415670.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a74cc557---poniselusunelubumizujeva.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/pewaxuzixesusu.pdfIn PDF document text
    • http://www.asslar.de/downloads/35588191314.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160803bc802805---89458209365.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210601155620112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ark+valguero+spawn+map+mantisPDF 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_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 19696 bytes
SHA-256: 69e79647e0b05fd1f4ee8fc488433567ab3f09f3a5709ec183939e08be05db2e
font_01_sfnt_off0001647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C92 10920 bytes
SHA-256: 11d00ae20d9c488b3027791aac787440fcb93146959c09b77e20323684f28a4e

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