Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3db1e6fb4cd2fd…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20953a900d5379acf5f8eac308a2b99c SHA-1: 087282fa35348bf1842ec3af0d4df24615d4cf78 SHA-256: aa3db1e6fb4cd2fd26fbd1c17c71842b6965a053d912cad07e78123fea84ecf6
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a phishing or trojan payload. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites or for SEO manipulation.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/46415596976.pdf In PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vabejamavevozawivipoxe.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/46209250399.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136703c9ae18---dojiwigafa.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/miwubafoxega.pdfIn PDF document text
    • https://0900107678.com/upload/file/96761943914.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/17423277380.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/savosusoditu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vjefjbf0porlisnm79fc2j85k7/4486570032.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/46508863326.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/kolefiwatopugobadigakipo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2784c507---desulewijovezitejakara.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/27090383640.pdfIn PDF document text
    • http://teresachild.com/upload/files/51961883292.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/zagosopovibozenexalat.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/tujeluz.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210909225628.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/kixudulupebegavat.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/11466677087.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/48064405160.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/24991888696.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93d3d731e---58477371070.pdfIn PDF document text
    • http://inica.org/files/file///rironuvaxoxuxirosel.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/xalusabifavulunapenabisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=international+business+competing+in+the+global+marketplace+11th+edition+pdfPDF 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 18928 bytes
SHA-256: 4a0ab5fcbea604b9e52f8156dc1b5642c0fe0235854df3d56bbab8cb4bd6ed0a
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 11400 bytes
SHA-256: dc9643b7090dec661b7ce484c7bc5b407a1811e1cc562d308f00e6ed6f3f1778