Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78a5a167f39c5ba…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 17:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6792a5bb38d37749ae8075c87e58d70c SHA-1: 1a4cebd67cf11bb30f9cacacb150d547ef6ab869 SHA-256: f78a5a167f39c5ba1251baa5cef6df56f68e55c415f557ed79788eb7e3ee13e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://tbff-bygg.se/img/files/63664760671.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/fibilunozujezuxutonitew.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/nijidola.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/tazinowesubedofelesexilel.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4nd3gu2bjgsj547a1drl2d1rlh/gerevagoro.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/78102462471.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f622r6oatmi8u4fn140l5hgift/xoviwonaputafogedaja.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a534b046b4---58808060531.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01d8168ff---sisasaletitep.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16108c4e285161---dokufo.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/81525359503.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/32815127712.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/30096334073.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/goxuveliwifipap.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69060416018.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4b9b2e1bf---zufatelazaserokoxuf.pdfIn PDF document text
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/nomumepapa.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/boxatuwowuzadixoxizativip.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wamovemolozetujewopuk.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79efe3bab6---67993117044.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/fekafadusazijakisudaj.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/46130416041.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083815e5b732---45349127368.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/bukibukurajod.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b9482f43d294497af306bfdd65a67155/befibasuvire.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/zuzukuvogijodawoxeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=andy+field+discovering+statistics+with+r+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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 17812 bytes
SHA-256: 916d6d0f8cebb9a7823b96efacd4c9499cf198ec712bc1fcae4023b4758ec040
font_02_sfnt_off00014130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14130 11144 bytes
SHA-256: 443a149feefbdf22035328d32725c463abe95dd3dcb07aa8e77ab8673e0e52ee

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