Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11e15850d41d1f1…

MALICIOUS

PDF

98.1 KB Created: 2021-08-07 21:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd1db1ab8636bd40698de76c27d45dc8 SHA-1: 3dc8e968257842d184a74ded930f2c762806bd28 SHA-256: b11e15850d41d1f1247a1ad35c039f7fedfe8cb0041eed171bed16c6c7837d54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also functions as a link farm, hosting numerous URLs on compromised CMS uploads and disposable hosting, many of which are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://allytemp.ru/uplcv?utm_term=latest+hd+hollywood+movies+2019+on+mp4moviez PDF link annotation
    • http://t-p-fortune.com/userfiles/file/88427847604.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be7904f8---73479238980.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae797f9b6f7---97783057949.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/81070537704.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/bomoferokugasigavitejut.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ebde19e---watomesiwos.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d23fcf80a---2653040991.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610760ce651c1---bufelulidad.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/jekakitamalopulaga.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe419aa618---25902388523.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a76601765---liposasuluwonanapojufu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6f6a255f8b7128d8b7dd2babad4bab47/84266272009.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/41266153133.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/24/vigumebas.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/51913773873.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/91739012797.pdfIn PDF document text
    • https://digireg.nu/upload/35252983438.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845b72c25f---gopilekudojevowagovero.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dobalijixuwigefa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/48d591a8ec1f90c5a287c7139540d423/lesejave.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/mi4tlj3j9d7vqu819lld2lfi7u/mofozazilolobaxined.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/40888107810.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/54675736390.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/97228074263.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_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 11380 bytes
SHA-256: fcc3832d394f692a24b981d99a50a8ee034ca5c6e8add08bb6080477f4cc0782
font_01_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 16560 bytes
SHA-256: 518d466446f0fcffba7aaee79ab4bef61b0745c013300abeda0320e4068e6388

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