Malicious PDF — malware analysis report

Static analysis result for SHA-256 2459dafbe128825d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 19:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a06f4979b3026c2484e26de7213afc34 SHA-1: f3321b3e046162d9cb422b33d6c0dad2c4dffa3a SHA-256: 2459dafbe128825da7d20e52a14bbf2fdef5b26e80f6d27c2ce934ae8421f078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cnsgawefgl.netsociality.com/upload/files/70261064821.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb055e869---mutuzitupux.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/doxivikofufofom.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/63754474617.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/wotujus.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/99677508728.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/buvuxu.pdfIn PDF document text
    • https://websbag.com/uploads/files/14202949216.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nubibimuxus.pdfIn PDF document text
    • http://darstin.com/userfiles/files/zuguxiworupaxefegovavoxut.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/jupogisek.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/biganugufonizirosilobufik.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/41096629778.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/8959686873.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499c00748e---tajiradodewedu.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/towotosinuzowegof.pdfIn PDF document text
    • http://halanmilk.com/upload/files/lulik.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466146650bb---pigapataze.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/26535715026.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/18950313128.pdfIn PDF document text
    • https://architektor.ru/uploads/file/dikexizimidoratud.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/pirivipeko.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/7160480582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chrome+version+79+download+androidPDF 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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 17800 bytes
SHA-256: 5c01946519df9d1c49e5352ed29f5f9c73903f1cc155b06ff8847c45387b3e3f
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 10816 bytes
SHA-256: 9d48c16a61504bd36f8095118bfa6c7dd7a5768349a255cefdd726235cede122