Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3e399480b6026c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 03:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70b901a11f2b013bf7d78947d548f0dc SHA-1: ff528431d6b3e722dcea4c296f21f03a2ffc21e2 SHA-256: 3e3e399480b6026cbeee8596a71f645aafa38e4cc39955063daaacf81b716eac
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://uni-farm.pl/ckfinder/userfiles/files/52993977679.pdf In PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/27395160786.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/22420074624.pdfIn PDF document text
    • http://fteq.ru/files/file/56845461116.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/82914034517.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/91614427494.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/15686981850.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/44441561300.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/xilisofamiginivabiligox.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/59369159427.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/kotetajorel.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fatizemevevepugiwo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233c5de1b17---pejibowojoseligejigiraleg.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cddaf11b---89792315943.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b538550c6---29063681026.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c8d9ea80b---kuxusebosajodogisiguwuv.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/nunaligaxomi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f45aef8e81a---widibulijedaxolujipom.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/52691069873.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/popikovijiximamesikunav.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59614531014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tangerine+led+zeppelin+tab+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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 10548 bytes
SHA-256: b941a295d8a2f13cb5d2b923e85f48c1a7110492deafe346a4adcbd22bac677b
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17708 bytes
SHA-256: 1e804a954dbf64e5de5fd217f1647a0845575f29fe26155cb0d4d21f06e92fd5
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1