Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fbb5e4798d0a8a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8bf1b6d4de9310f86c04b583ed272a1 SHA-1: b03ee06c8057a5cde84aaa1d7ef63bbaf9dfc5ea SHA-256: 18fbb5e4798d0a8a2fc4a0bf29ab5951800da253ff29e4c6d3fb88ffd261aa3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The presence of embedded URLs and the overall structure suggest an attempt to direct users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://terezmisszio.eu/files/file/wobijadademozipozofodor.pdf In PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/voropusofu.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pegisajefabusima.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/puwafuwogezovumelukesavo.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/jotetixinuj.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/zumino.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/kewufanonevekoxebojobu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/7626274867.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92882945631.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sekejapezasosi.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/rowomitidum.pdfIn PDF document text
    • http://abwessex.com/uploads/files/vurimujadubivakiwovuwur.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/11981748234.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/3971085012.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/460455a5b3cfed21a1b43dce2b1c4a54/retotavuwedozanowefepasup.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/34460585731.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/58906610924.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131c79184f5e---11810043089.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/051e3f529b64c213a4c159f024e06dd7/pozatepipefojafop.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/modofiwegexakag.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vukit.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/14016486421.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/faxajexo.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/45181585235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+papa%27s+bakeria+hd+apkPDF 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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 17372 bytes
SHA-256: 9c7b8bb71cee29ddffe130c2a0f3617e8ed5293609ab8c73d8ba26748cde3a90
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10744 bytes
SHA-256: c5a0f56a89e709e51a2704672b935956baf837d000504d4ba4732a5ee520aa11
font_02_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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