Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c587753d0a5ea77…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 14:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55ad5d3c2ccdc06fbb89dc627753384d SHA-1: dabaca62aeb3942032e2a11c80a7f52baf8be40c SHA-256: 3c587753d0a5ea77a494d8fd1677b07973f2c58e311237388dc36aadb47d7f68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://maffart-guy.com/userfiles/file/25233018430.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614218fe8ac2c---78851849945.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/74538886899.pdfIn PDF document text
    • https://emenu.hu/editor_up/zifer.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/kavufoxox.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/40882907914.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/61192455424.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/zudipa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d1eb4a0b---bukawebukisag.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac190db38b---lerakefile.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kiruxupi.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/62975034571.pdfIn PDF document text
    • http://www.buildonhope.org/file/51112043024.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/06c7328467b728b74e270a67bef23a7b/vuxojalesufag.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/43436925434.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907112501939.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/gabafefagukuvabesa.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
    • http://precisao.org/files/files/dowupukitamoliweledubepe.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/73705853923.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/wowuzimarubo.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/sijonivobodu.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xoxijimolozarobu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/63954216382.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/8899135299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=types+of+keywordsPDF 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 10244 bytes
SHA-256: af92f375eb34157bde5f7944a64d0589aaa9a87e139db41b4f685e252372a751
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17164 bytes
SHA-256: a6145202fd7707f7a402544e43aa96788113d568b978e115381e454466add60b
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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