Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3d268893bbfbe6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 15:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5821999edf58261bdf2e223f76f297c SHA-1: 4631b1f5163d75cabbf64eda41efb5a0825363a2 SHA-256: 2a3d268893bbfbe6ac5d405df05fc386db91ac0341d1079bbcb04a7415522c70
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points to T1566.001 (Spearphishing Attachment) as the likely initial access vector, and the exploitation of PDF vulnerabilities for redirection suggests T1203 (Exploitation for Client Execution).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=how+to+setup+retroarch+android PDF link annotation
    • http://brilliantsolarpaneling.com/userfiles/file/1072458811.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a438800a1---93862961297.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/48383538324.pdfIn PDF document text
    • https://rubfila.in/files/file/xaloxuzo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/42766556917.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/janixininebub.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/duvabikalurive.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/sebivetatafikaxifapodatam.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/tizebokat.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/ripekajejefunaze.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/wisogogomivusadiku.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/vesigima.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140462a0a363---71048831866.pdfIn PDF document text
    • http://vhshf.de/File/44705413903.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161469b7c08ea4---tezozozina.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/6646513879.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143371d23cfc.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/68820088093.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/65881556575.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bereb.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/76000153302.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/vifolipasezeboz.pdfIn PDF document text
    • 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18228 bytes
SHA-256: 414fad53958d0157ccd3763a9adfd779379b9082edf7ca2f46d307ed428bb305
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10740 bytes
SHA-256: bd5b8764af5e8ed4f4c5bc179f18b50034d24f902657c2543b04ccbbfc204b5f
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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