Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e309b29c8b97118…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 11:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7750d4b90d045a01ec7bdeeb42c660ed SHA-1: a389af7298343bd222728dc82bd51a667fa956d4 SHA-256: 6e309b29c8b9711800a03c411f0f153939b10a6f456b080ff2567d0bfd05e6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dienvietbac.com/uploads/files/tidavuzofoj.pdf In PDF document text
    • https://halkum.rs/files/10184926543.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xokikem.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zetemuluzubarujuv.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6ed962796caa30c4394bb79a8d31e8f9/bumokizipojesezopezip.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/68078502204.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/gipawijiriwigewum.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/67375297073.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/38891663885.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/76080898184.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lalemuwolubosoniwizana.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/mirawexixodojitirujo.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixidaki.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xukulamilebixari.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109032156524454.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/zopinopute.pdfIn PDF document text
    • http://vlajamo.cz/images/file/radojupidevemilopepo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a8fb7a4d---55993021757.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161414d38a2ac4---1887111048.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gaguwunuxujinig.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/turejufekonatavexi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/derezisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cheat+bussid+simulatorPDF 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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 18312 bytes
SHA-256: 137490e614c14ee1a43ffa7ca88014a1c2650d71a64e1474db4b9121bca41aeb
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 10680 bytes
SHA-256: d6b4693682db2ff0c1fbee27ab12f28b17f7f726bcde1f02be685cc979564ce2