Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d774d735602af0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 20:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b372799415281a40b1013095753ced8 SHA-1: 452663c40035e539250416e371cb2f6e3680c120 SHA-256: 52d774d735602af06a7a1895b2be3d085a74819b1c09aca2d91d692e7b2e8450
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains elements suggesting it's a lure to install a browser extension or update. The presence of numerous external URLs, many pointing to PDF files hosted on compromised or disposable domains, further supports a malicious intent, likely to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://livermore.com/wysiwygfiles/file/wamixuka.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/19504989634.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/63567677.pdfIn PDF document text
    • http://uchid.com/uploads/file/tifilaripitusor.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/pojubefodajame.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/figude.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rrraoha6l3dn4k8j7i35k0pph6/jojuxetulizilujo.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/tikokugeludete.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109100337274054.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18158791283.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/43447316232.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dilunojevik.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/66236703618.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161484d10c8712---mufizosebonukofupalixemi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/78904599861.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c525871---84241728055.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151432248473.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/15601881345.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zosajimelaje.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/koveb.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210904061052.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/23220820473.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/luxopakokugedez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gacha+life+7.0+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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10356 bytes
SHA-256: 6620a9fd8e9a0a16e18c438847a652c2dc5aa7c2acab27d81f16e0885452f044
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 17716 bytes
SHA-256: 24110eab7ee5e1bd8ecb75fdfb281754dd6a39a3d1b84d6a88fe992a8868867c

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