Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7dddc42cf3421b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 00:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b7f9f8e4e80b954cd2ce61cb6e6b74e SHA-1: 0915ab1dd1fcf3de4736435fb4fef345b1dd2568 SHA-256: 8e7dddc42cf3421bf0354580d48ea2eb0937e02c78fcf5dd3733f80c05c1bb12
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external links, some hosted on compromised WordPress sites. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of a link farm and embedded JS suggests an attempt to redirect users to malicious content or facilitate downloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://parquet-cortes.fr/data/Files/45025548314.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0nmb5g3fg3dufv496rrps76iok/49081457602.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/jurokuribipu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26308101602.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/44925841810.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/23307852482.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/42670470526.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/62887135202.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/nukujes.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd90229096---50448903414.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/77160537539.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/velodokemepisutuxalan.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/98981808284.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/soneb.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/lejikekozijifudovape.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57262045554.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/wakuvewenuwuvixejojum.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duzerupapimaf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130aefe248d7---mefekinefeputonabanir.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/sokusexufi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137377b0bd73---57646417556.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/87660305856.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18731433326.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fadipufegozojarewuwote.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/dowebasobetem.pdfIn PDF document text
    • http://househouse.it/userfiles/files/mezufomawunotujo.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kumelejonudogigom.pdfIn PDF document text
    • http://prosquash.by/data/mawelazajisisipeludux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=subway+surfers+apk+download+gamePDF 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 17668 bytes
SHA-256: 6b938b50c87449fdd5c965167396b179c752ed049bd974b7272b1e35ffa73959
font_01_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 11260 bytes
SHA-256: 886a04f5680f4a7021c77c4457a9082f563a6a69c9ef3b3c6b1abebc298ea70e
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1