Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cffc972ab9c2b3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 16:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81f4d3bece8afa993ec387ec7fac1320 SHA-1: 6f94ac6885c2aa6333098e9eed2584a89527bc18 SHA-256: 32cffc972ab9c2b3f48405d766147e0aab0183f3546c97179f1315e021bb99f9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=nice+words+beginning+with+v PDF link annotation
    • http://ahcxdq.com/uploads/file/170149017967.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/bonazakes.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92604382222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fbf91490---janekalevitamidon.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eef5c86a6a---gofapabi.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/fazexen.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df76aa32---20881451379.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/87016561548.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136832a68942---71027290075.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/viguvo.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/lapafepipisuwadan.pdfIn PDF document text
    • http://biosite.ru/images/news/file/mofobixomolizal.pdfIn PDF document text
    • https://pmms-online.com/assets/file/mitufadalidukizewaxuvedo.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/makuvoguxozimozumiserer.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/56159237936.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/xegigubufuva.pdfIn PDF document text
    • http://screen.by/images/file/vasekipukagevu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fixeso.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/24906497617.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/46398731737.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ce80ef42---novugepexotera.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/47060450533.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wodumawumenagosamezu.pdfIn PDF document text
    • 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_off0000b2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E6 15556 bytes
SHA-256: 7ac449a3572cf4adc4f4dc3b025888b90059c12e46b5a28b1414258788493ce4
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10708 bytes
SHA-256: e8ac11187b0b99f168c9b60b9edb4111a1dd38e6911112f49e6c683f08a8faf6

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