Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce1013efddb917a…

MALICIOUS

PDF

68.0 KB Created: 2021-09-22 21:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 256d42a974a44943d553eb7c87d8682c SHA-1: c19a6e9bbfc4d5c9da8e3d43d48c474d0c761abc SHA-256: dce1013efddb917a7597131af56371f03304d14a3e1923f34c8a3689f37d19fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads 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 farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=handmaid%27s+tale+storyline PDF link annotation
    • http://innotack.com/userfiles/files/jirujot.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/5499537698.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/74622131005.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/17992918649.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/vunuges.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/jalaj.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/jejixizojifilevar.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/piminorotid.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wotulakox.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/lamufomunofubedilotateno.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kirova.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfbc34051375aeef7db345d13fbdd69c/47784321419.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcbfea139---96612333994.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/maxoragigukumap.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/ruxufewepososoritupis.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tagipimeli.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/58cfdedb8915a406d0208905592ece4c/66946482734.pdfIn PDF document text
    • https://combrooncom.com/contents/files/wugojufukuwek.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zilabufokitulasazofi.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/bogixurukoxirowes.pdfIn PDF document text
    • http://centronegozi.com/public/leximalaxakogitolila.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_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 14948 bytes
SHA-256: cae446876dace1b25ae379e7e434a06af84a677127f3c5d7fe3182ae8b0947a8
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10548 bytes
SHA-256: c393c95e5637413beb38568a42b41c6d2f5423aa16e18a03620e2e0d0b2ec998