Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bdbc63401dc6cf…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 03:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4f807dfbe0274a590c6fbe5888735ac SHA-1: 7098fdaaad47d32d1a020a4255966117298270dd SHA-256: 79bdbc63401dc6cfebc78bf486dd5f227d35dd6acbe894173007f02069365974
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=traffic+racer+unlock+all+cars PDF link annotation
    • http://www.klimavill.com/data/editorfile/ginejivez.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/luribudikegezirebopim.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gufusuken.pdfIn PDF document text
    • https://triosms.com/userfiles/file/85700329615.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zumobopopejefatubi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jijuxusegurudop.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/madutanaxilotesi.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/45857375105.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/selegokafilikidipubejifid.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/64654072587.pdfIn PDF document text
    • http://idroter.org/userfiles/files/xapuputopimediwigeko.pdfIn PDF document text
    • http://lecostationery.com/files/file/7939607732.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5d76d3ad9f028a5aa14b4ca931827efb/rigenowamevutib.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/4878999018.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/46266739914.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210906225656.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kidokazezejetok.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409074c45b0---79905698371.pdfIn PDF document text
    • http://compsult.net/userfiles/file/gedemo.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911142932_506116834.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/86753373901.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84709fc4b---gipikidanisonezuwadizajow.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/vufugexokuniwajebubaxulej.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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 10384 bytes
SHA-256: 4dfb5e81fae1392ad60dd2a66672745091d9170b14c0c31158bd4b6fbac7c71b
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 17480 bytes
SHA-256: b45eeabf873e489d2b91f3d3e67dafa28003a14616863cead7c8c098dc376adb

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