Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdbad08926e058d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 14:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 081084d945c2dfb5191aaa59e745443b SHA-1: 8c196625d239798857ecfe1621855b547f3dcc1a SHA-256: 3fdbad08926e058d514a76c7488935cd7f2a2e239e7723f433768b9cf5c7eeb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites hosted on compromised CMS platforms and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bazis-expertiza.ru/ckfinder/core/connector/php/files/rexadudiraleranosu.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969c1ea616---kujirikuroxitufipanapido.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/gotemizakasodonose.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/89392647338.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/sunematerosuzo.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/77263162862.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/30693615350.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012115181348.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073017d9f83d---bebavo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4525f4ecac---53113409134.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/rudidojidoxaxerewefi.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wukudafejomolumapoli.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/durezitimixo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/51256660702.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/98759772513.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3f7f529984b304d3057956525aa1cf10/mifuputabifomugadeju.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/najoranufazakowazorow.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/44165098420.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9dba9645c6bd558ea81a4ae872d6aab4/rekidudesan.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sk2qa77h15ff00qjnk0js84p17/kidiwokezuramaxiv.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/dokoredatuwa.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xapitevinomugorerirenobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=preview+pdf+in+file+explorerPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 18360 bytes
SHA-256: d4fd5fc3a3170545bedd6acf62a7bfc1f7ea36e38df26e0ded96e4659a94d071
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10316 bytes
SHA-256: 8d8aa470f4274140f09eaf6ac73d6c330f1b71633a75c38114e2c5be3b14b025
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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