Malicious PDF — malware analysis report

Static analysis result for SHA-256 66735daddb455018…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 06:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfcffa2642ffa11cbbe9179f8a8a3587 SHA-1: 6d8f88a61d78040f111ea7b2dc0046f930cdc84c SHA-256: 66735daddb45501835e9bc76e4e2c9bafb25deaeac68da068f8a4bceb9fdb211
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.netcorp.hu/data/editorfile/foluzabetasimasevari.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612c99e0e0050---nutujalolewoxuxupidawij.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rovivagakamadajexo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3105d9a83---kajogoruloga.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/26126920135.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/rumuxizefixojowuvud.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9470d6a77---23992468889.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/61289671133.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3041e57b1---wonepupuwebipakubi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f90b0ea9---lalidi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/14196739895.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/xukot.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8ec1fa03bebfd54f9a3ec970d4789a89/82385803078.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/60497494738.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/wizegiwotemaru.pdfIn PDF document text
    • http://eternoohydro.com/d/files/8644475074.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b33a6ff40---32751147631.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/gobizeril.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/xepoki.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6824a9e78---debenura.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xuzexufikuxafexawesenegoz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077142650526---69059486034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f38529a23---lagijogison.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b89e3eb98---pomagovonev.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/kikopapefudavodigerukite.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7ca0110e---11857636912.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a8c520eee---95638785217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=women+spanked+in+moviesPDF 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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 19136 bytes
SHA-256: 6ccc60c2ae97fa8eecc31e1a550bdfb297a2350dcb879bf3a808bab8822a6d6f
font_01_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 10460 bytes
SHA-256: a4cb7b6634d1edb36b3cb941e44e873740f08f2fb6fe537be18c643e89b4233d