Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e23e6a6be357c1e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-15 21:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d4ff751b3a903745f1e326d099b32379 SHA-1: 7869180c5d41fefc718a64255aa9eff879f1fc5f SHA-256: 0e23e6a6be357c1ea988a1af281850d4660c582241a54d38dafc3ff0a1b2746a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are used in a link farm strategy. One URL specifically targets users interested in 'georgia department of revenue unclaimed property', suggesting a phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=georgia+department+of+revenue+unclaimed+property PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607956a091cb9---78605786856.pdfIn PDF document text
    • https://0900107678.com/upload/file/63815242792.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a15m7k94grq34g8dghba9rb6d3/pezegi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab23c309---xufoxojedufepuzuzom.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160717b3a88e8c---46930064864.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/96550662084.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/13099022657.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607483a2330d6---95931124928.pdfIn PDF document text
    • http://northcity.rs/slike/files/tutuzififezaxejalote.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebca65bfa---gesagekolajujelug.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4d01c54b---83637911193.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fikore.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f3934d7a987565b6332435dabe0e8f33/riloxasepujodibagoke.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xexizimulupotizew.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bawaxomem.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zulamelejufojupo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/wureson.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/wobereg.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210606_589F61533AD72329.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/p2ovhtag0sd02h874vm56u8olm/zawimilajasavutexulir.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c55b73d9d7576cf0ce9d2c5935cb46ce/75114961408.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779ebb13b2e---palivimuxagomavagazip.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabb6a736f---vinalorasod.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/76821768562.pdfIn PDF document text
    • 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 11116 bytes
SHA-256: 3ba9847110a9733050baa3bd1134a004a8cff65f64851a6550ced9066f244463
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 17868 bytes
SHA-256: cdc417ea764311dbc9565a940b146c97f0600aee1f7db1f57ff2121fa48e806c