Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a23b071561f754…

MALICIOUS

PDF

86.9 KB Created: 2021-08-18 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a3a86eacb81d05208200f51d4cf33e8 SHA-1: 9bc446ca65d6369b1fb064acaa66278d78d06258 SHA-256: 89a23b071561f7544ecd87eaaf3dcecd471ae30c9d18ffb92f21702e4d505953
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of a link farm on potentially compromised infrastructure supports a phishing or distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://blnk.eu/userfiles/files/98231260031.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/46663108633.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/97932878178.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/279ced279b3bac6f70511d8e8867ca22/59443727629.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609423d54d150---4803971318.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/57694306881.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/16ii2h32sa82aggsp42ftf9p87/sitamezeguki.pdfIn PDF document text
    • http://hadt.vn/upload/files/56865757695.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/93985181398.pdfIn PDF document text
    • http://headrepublic.pl/images/files/25467023277.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/52086328542.pdfIn PDF document text
    • https://yellowstonewildlife.com/3613105853.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/rekemirolemapafiwakusire.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/bidokefobugo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/70337895569.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c79373bc---bibofozimujunumadunute.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/79464097806.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/femuxower.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/24652126113.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949de853040---32226148508.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/20379188929.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/91407723216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grammar+practice+workbook+grade+9+answer+key+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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 11556 bytes
SHA-256: 672f3824180ea04d61ac64059209d0cd44ea321f9e6f9319f799fed692db8755
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16804 bytes
SHA-256: 026d46545601917d6940d23716f6425af1ebc4c0c8a827425e9cb29b8ebaefcf

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