Malicious PDF — malware analysis report

Static analysis result for SHA-256 62208c654bdbfcef…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 04:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de9f4edbb222ee0fb7e613a34d46d3fe SHA-1: 9dc5af76630b349e4397c1f85a48647862a17c6c SHA-256: 62208c654bdbfcef31cb72460bac3d3d99e3ce69bd6217bad1103f8fdcc6dd76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it's a link farm pointing to potentially malicious PDF files hosted on compromised CMS uploads and disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hondatayho.top/img-ngocbao/files/dunubuvijedav.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pg61pv3fis4n3pgfsd0q6en7u4/15574147051.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xujakinuturilejab.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/68662698962.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/65509132667.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nogosoloxoda.pdfIn PDF document text
    • https://binhvi.com/upload/files/ziwitivatepi.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/30013549642.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/45898431234.pdfIn PDF document text
    • https://dukupahit.com/contents/files/57584386056.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/bomujufi.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/83657295806.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/2970323015.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/15954285662.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wisokanodumedajozukil.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142655957dae---66343609143.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109141217041523.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a703ed042bcbe18db57e8888c0508d61/zeluxofitujofuligu.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/91949238930.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/sunomofinelireriked.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/gofuti.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/sg4k9dbmsbincbu64tu72mul75/gapujuzuxixudeze.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/17417136412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=scan+qr+code+with+iphone+12PDF 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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 18064 bytes
SHA-256: ee11d6970078a4365c6e46ea2e802afa39e44eced9a5cee72a7f5011fa6a8645
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 10876 bytes
SHA-256: c45b37e19bd488cce5a060720afe7aa486012e21a9ad5d93d07a413e0efa5e61

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