Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ab5f71a57d93ba…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 05:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a163c9d2ed168308582a723264f72f1b SHA-1: 58e09b2bed783a647aba0c0cbde19e287a0fd37c SHA-256: 31ab5f71a57d93ba90db3a445925999fafd677f44a7437b307eddd11bdc4f1a2
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 initiating redirects. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://kooijobs.in/ckfinder/userfiles/files/ketos.pdf In PDF document text
    • http://shamayachts.com/upload/file/12430815127.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/64613945355.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/58629862863.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37370710900.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wokudakigarepafod.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/57157189418.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba85fad9133---45123892200.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/delopijijamozagebexalevug.pdfIn PDF document text
    • http://drhkltd.com/upload/58218065987.pdfIn PDF document text
    • https://razredna-nastava.net/files/tawik.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/nejetaloze.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kinenizova.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e49fb1932---8300625860.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/1796539177.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rogorebasuzoj.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/vuzuzodosejibeworituj.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc25c9561---26613821913.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/visif.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/17592063720.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/30576197683.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161093baa3ccf8---niwipibugutugazuxozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=estudio+biblico+del+libro+de+esdras+en+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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10836 bytes
SHA-256: 7e0e2ee6aadbd43ccf23ac0f6d7e6cbd2482c83f8f2b53ca30e8e5feb0e60ae3
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 19504 bytes
SHA-256: 96f0f4dddda3f2296065028ab80304afb9b515c0d54d9080bcebf3129b757c70
font_02_sfnt_off000142ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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