Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaf732c83da8305…

MALICIOUS

PDF

83.2 KB Created: 2021-06-30 09:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 314e46c07b0c1c308ad7a4aee16e5b82 SHA-1: 8250764f78e60fca180f06ef1262621f9d55c6fd SHA-256: aaaf732c83da8305a83d2c8836c59138feb733a3e92b0575f09e79a94105a675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb07ec28976c3bce22cc263a52cb870b/34978804090.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6fdfa01d822fd6f7a4e83743532f9f62/terekabenojowivufakukewod.pdf
    • http://cesishotel.lv/res/wysiwyg/file/76580555176.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d66c077b0---59173008906.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/n2a5fii3fv334p3gufaulke0br/bibasogatokofekuwej.pdf
    • http://epoxidice.ro/mm/file/25906328673.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fbfc0326a---forawev.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9cc227ff---majemunapixoxopezawo.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/eb82ff846df37fc4344e682075019985/jobabagixakogupokibiv.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d1fed334573af4ccc807fb4e9f70ad4f/masofuwires.pdf
    • http://location-appartement-venise.com/italie_documents/files/18060621228.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ffe80f0d28f7cc0a4dc063b1d2fdade/xebonifexukab.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943625a6c21---58812298212.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd033cc3f---1480732178.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607674a8696ee---75882179736.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5bf77cb14b0ceb73602cdeb85b50bd20/98156982948.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sazopisuwozexedevovukev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d802972ebc---kixipiz.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29bdd12c34---takugepitunonezobevona.pdf
    • https://emilline.dk/ckfinder/userfiles/files/gekoripuxeb.pdf
    • https://soudurelauziere.ca/upload/editor/file/17150777149.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/47383584428.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kolelasodafawabowodulitav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=thank+you+lord+bill+fay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdca.bin
abfa281f654300c60c8271fdf60d5c05189d50d0970553a208a53589bea44d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 10464 bytes
font_01_sfnt_off0000e558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
font_02_sfnt_off0000fd69.bin
dccd5657f0ce1bc24da532906adb2bf309f5577dce17ecc84b141685197f8139
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 16236 bytes
font_03_sfnt_off00011327.bin
970ce3164220c664f1b2f45d5d8e210e070c20804604241d87b0dd5530636f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 17324 bytes