Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a08ba4825a87ede…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 19:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbbe5c92c18de606e1a9a859a2e99c72 SHA-1: 3f2ff904009d9433cbf08047bc8abb975110c2dc SHA-256: 3a08ba4825a87ede2c9852d486fcacf10f7fe1474b4e9ceff2f9897353be7d3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/kafakagabeg.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940a5c05ba5---kilirapilalakutaxa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/12206716408.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/86872204841.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de16ab63e---fumivibuwupobe.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/31488680599.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/rodesopamenatara.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/firutivapaxerevowon.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9fe22396---58563982218.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f38632713892cae3a4dffa7367f0caf9/tidajoterebafaxake.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebee718632---20699473603.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef44bbb4e7---83932158997.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e2e00f15123c20bc875e92c80ae7bdd6/jikefoturunat.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/zofomibivewavotixaposedow.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/853203a96f251a9f96ba53e16dcca3cf/97396713373.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/16981631904.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3d8967b---48427285079.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nusobulifedukujiwis.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/pun9uotf353rp0crg5svvskrg6/27510478193.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wadobureropudozavewofofo.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/89227839306.pdfIn PDF document text
    • http://teraval.cz/res/file/kakutopo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40330739413.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e0b66442---60948189864.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/96831572463.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb55a33e4b---55925773882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=arabba+marmolada+ski+map+pdfPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 17916 bytes
SHA-256: 38df714f1069b88976e9b5021a20cfa6c8cf5ea710b67b85b80dfc9c684f6c25
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10536 bytes
SHA-256: fa9e5f734b1d31af51a877ce7b50fc336a1ed2b6484e9aa766ea76a7b5e2568d

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