Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fe0adb5ec9f694…

MALICIOUS

PDF

113.5 KB Created: 2021-06-28 01:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b53ed81fe68efc85fbc9f55cf77d59c5 SHA-1: 84d5983551a911ebfcba0ab0f3d4a12d4a6e32ed SHA-256: a5fe0adb5ec9f6943a4622f0e515e61ab61290de15a0b38240712f1292b3f474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were directly extracted, the nature of the embedded links and the 'link farm' heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4fddcfb1---15050386951.pdf In PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dd6a0bfca9179db2d8a2bd82e8b81428/63551230593.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8456ec08f4f50eccb196397e63e96d67/99415693061.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19e1b02d46---31860113983.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/51927800690.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/jimixevonolikuxawixepu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/pexemu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f124a44b---92620790063.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pajovoxovurefavatebewilu.pdfIn PDF document text
    • http://toonesk.com/upload/lajulokonijono.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cb989e86---81731627291.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ade73e8af73---59402633895.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61f2f5d9765eb71d6ca2155621bc6132/35856283426.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/nikifejino.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35353923359.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/ponosaxorib.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/tofonipifen.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/bopebenibiz.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdc03d711---degedadonalavo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6a8a61e6---jiforamogalixixibibalil.pdfIn PDF document text
    • http://rayanchem.com/d/files/vegotuwasimovinoxekopuros.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8326c40c2---rosiwadowi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcc2a9fb6d---nexememejebumezulapij.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/68165119568.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/q56nrhl85cqmj1aedpk3qb6gt1/bonupiwipibowejos.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/putererila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=peridot+meaning+in+the+biblePDF 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_off00015a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8C 17720 bytes
SHA-256: e499b3257fa5796b7d201dbe3e7ed9fd63a3327532d882efbe1fce3ff0008a1b
font_01_sfnt_off0001889c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1889C 10668 bytes
SHA-256: 37d43694958c2dfe88eddf0be2b3690c8cb45a67246a56655c37800f25b1e211
font_02_sfnt_off0001a08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1