Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc7b37a76e82302…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 06:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a77f5640328dcf2372d7cb3f4e094bf6 SHA-1: b3980822081202aa45db198ae762e7a29bbfa48e SHA-256: efc7b37a76e823024524dc4f6f4ccd6f4d61aeccdea58283febb6955913c5fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://dent-pro.cz/pic/file/58457818035.pdf In PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728b04842b6---98546446137.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tikametefomukonab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79c9661e66---jidubilivowusax.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072eb6e578---57220973562.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/9005854933.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/31884711349.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/dafetutukujesano.pdfIn PDF document text
    • http://www.depomatrial.com/file/belizejovupatejizozajomeb.pdfIn PDF document text
    • https://ancoraeducacion.com/images/bigajevepe.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/jubujadajopesid.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/ralat.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/14c858e615495d43896a9ed33204c5f4/36871403686.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/86577163397.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/pisegomoxovar.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/90673374368.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917dfc826bd---14490610061.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/ginokinowemolujoxisunifot.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/76880550812.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gcbnl0jm81mkt7jvlt2mgclgme/babur.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/vuvojugupirakelipatulude.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b3120185---fumuxusumibejaxikigiso.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210705155816958.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kejim.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/gujiwenenadivepoxezoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=haendel+sarabande+partition+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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 19824 bytes
SHA-256: 8a839b40dda850177750be9b768124152d69814551f669d09f2a6c3005610bc2
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10624 bytes
SHA-256: 2b9d3f3e15bbce6b288840387a7525d25f786204e6901a99028add770d776337

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