Malicious PDF — malware analysis report

Static analysis result for SHA-256 de469be8ab1a4e95…

MALICIOUS

PDF

89.9 KB Created: 2021-09-20 07:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 53234ef93bf8af6f48143d24cc3a3a5a SHA-1: 8c714e788e38790bd2aa10ca52d9d864f5e37348 SHA-256: de469be8ab1a4e959324ee6c14ed3014e8a7b5039fd837a27e1700f8336f5eaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, some of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern designed to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=android+auto+app+alternative PDF link annotation
    • https://cafesca.mx/ckfinder/userfiles/files/30565981875.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/64cfe2e4e0f798778cb5cab6f8ffaf90/tufigewepib.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3peav5p6bicu5m3l39jmm5ript/pumoj.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/vuwovimebifepilibomafafip.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a48b3bcb---vezegiponede.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/vozajafivoveto.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091402115169.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/pifufexukubuzub.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/pikukope.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/ravoziluwakizomedojeme.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109101145534487.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sexujune.pdfIn PDF document text
    • http://mobilenmr.com/files/files/43009443100.pdfIn PDF document text
    • https://strechybenesov.cz/content/fifido.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b9f09d8---xepunezedufukobevabavutu.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/xajev.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_139923376DCAEF85.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/45961201460.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/1787759581.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7acc49736---53201423791.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d346547ad87e091dbc350e321a57f8b6/dixururigepilibedon.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/14841662847.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/suniluxuwupipodise.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e03a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE03A 18340 bytes
SHA-256: 0eb794d36e8725f16170471f0892c6ca74cc48d40fb7953fa5a7384fb3ffce56
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 17388 bytes
SHA-256: 86db55bdab95148055c749bacfbdd0dcc5e923befadf7999673ac2bc76bfc13b
font_02_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 10364 bytes
SHA-256: 6eb784698bb7f8c889775e4dcb9658a136a58d98a7c0ff9039578d8ca87bdd1f
font_03_sfnt_off000141be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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