Malicious PDF — malware analysis report

Static analysis result for SHA-256 da15c5e1733b2a32…

MALICIOUS

PDF

88.9 KB Created: 2021-08-05 08:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f86eee7f80b4e8ca852c7a5b722decfc SHA-1: 12a8be4d6b8658da0965b3d2fcf63ac41bbbcda1 SHA-256: da15c5e1733b2a324f8226edbd5339ba6a0048b5443eeebd1a17a142be75a397
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to a tactic of obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ecd11637ef2d6a74d48daece0a2f468d/lobivikavorozevijuw.pdf In PDF document text
    • https://cupanghitam.com/contents//files/giruwonexokev.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/98399641344.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/3849986010.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210617125719.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/93375125891.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/98996359469.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/rimerirugozad.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/13826875011.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/50353299632.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086782aec305---kafibisozigolujevunon.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd3e25715---rimatutokomozuvol.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160861b0ea3cc7---53282749585.pdfIn PDF document text
    • https://chpcentre.com/files/file/21884086600.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107a63ab6bbd---nojesewegeroxunajodudun.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rajaxabebimotujigel.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee004aed22---81011196939.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/5262734130.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ebc962031f02c4c4542528a5a3d3a166/83372176184.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bc50f202---zonojixanefuw.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pupotilepibo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/78035795863.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098e72885a7c---dapuwukovawusaz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d550cfeb---3763615930.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/10563347518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=los+siete+h%C3%A1bitos+de+la+gente+altamente+efectiva+pdf+resumenPDF 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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 17924 bytes
SHA-256: 4f90cc52677daaa154be1496c1f89ea6ff87b23f72f42aa997923eca37a59eea
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 11508 bytes
SHA-256: 61bac0b52b37644b25526a2bfd89625a111cfa9cab94a8f9ef97c3c82244d5b0