Malicious PDF — malware analysis report

Static analysis result for SHA-256 103187913ad3dfb1…

MALICIOUS

PDF

96.6 KB Created: 2021-07-16 10:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f954c8cc0ea32ec42e4cbc9e4e574f6d SHA-1: f1a82aba6d0ff677c69a1bfe01ef2837446cb27d SHA-256: 103187913ad3dfb198fda684b4262f59abb483278d2aa7ded19f971e7997b072
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to external resources. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan, suggesting the intent is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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 http://solarissoft.com/img/userfiles/files/26815244260.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1291401ec7ed868b40c6ec1cbe7936bf/52396920265.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2ae87fa8---tafol.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1417546845---63874738498.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pakorupawofiloxitupeve.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/69017040711.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/icb7rc9qp9up1njlb2meticiip/xetamurekemipatubibexego.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947aa32e4de---48691438267.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712a575512e---75419994156.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e5ad2037---gibepufosusoxuzufo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/352ab3fbcfdd480cde4db4e388533356/kinavekofewokoxudolito.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/sosopuvusilozobomu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3543c846---35468089401.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/93458046617.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/48406188499.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e9d72e42912a77709c740ce1b353087/debaza.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36d957a7e---nimobuwagalomi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/wotogibenilejam.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/46202109928.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fubadanakal.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/25f9409a32c0dd03565b680b4a31ae85/ludidimu.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/pufitaromebav.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bo8c0m9boqek9lv8cmbmpjmrmu/joxumowafoniwazeb.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9f8fd4e---68020632076.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/migemek.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/35401516216.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/sevarerep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=de+jour+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 21152 bytes
SHA-256: c900aef3ae13311fac16a6962415d6e920f4ffc901fb1300db4947e4e6a7ad2e
font_02_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 10688 bytes
SHA-256: 91cff1d3cd718051f72bcd683ca190726837b11875fb51bcd118647afd0e4610
font_03_sfnt_off00014e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7F 2888 bytes
SHA-256: 7320cd93e0b97a392a61ea96563ce5e73ea110c1ecd2a68ee5e9dec20bec15d3
font_04_sfnt_off00015a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9F 16720 bytes
SHA-256: 97edda07fb418bea049390caa55e0067b624d935f43d4713007d63852d854e69