Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8e297bf6556f02…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 19:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7af038d1eb4adf35025e51030b5d58f1 SHA-1: ebf7df24c5462381a98e980ded80f3a61f1a19c1 SHA-256: dc8e297bf6556f02d39322eef3086df2497c9ed28aca5fd5c95b1f881cbc0e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/gurewosagirawopemi.pdf In PDF document text
    • http://vpecargo.com/userfiles/file/pibatediwabug.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/47048445041.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/67777333769.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/46793329652.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384698d25dd---petajomopawikunexewan.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa99d9ea4---gomopitineripudepiri.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rezugax.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rimokewezir.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/20853865686.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/fijugekuxeba.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf71b04c0---nurerukesepumo.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/zigegijonutibesupupogiwew.pdfIn PDF document text
    • https://iword.de/userfiles/file/nuzetukufufiz.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/tosetokejuwuxotig.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210909002104.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/tuxukipe.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/vosibowipisapo.pdfIn PDF document text
    • http://clingac.es/d/files/92671496174.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/lupikokofi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63024052487.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/15571435609.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/95762849533.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/55866480495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bitlife+update+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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 17088 bytes
SHA-256: 522d29bb8cf5b8befac6508b9375ba18776582f7076ba5ad36c348609c1ab1ca
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10476 bytes
SHA-256: 116d4ebcf7cf27bec46341a5788cd01a3425b61f3ebb43b9a5317489bed7d118
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1