Malicious PDF — malware analysis report

Static analysis result for SHA-256 7897fdc441bdebec…

MALICIOUS

PDF

73.5 KB Created: 2021-07-04 06:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e894bdad698778afefd5c6e9a42d8acb SHA-1: 92209750b7c37947a2d7ae1074ccc0cdcc089ca9 SHA-256: 7897fdc441bdebeca2ae228c88ea10ad961a563044fe003e4a6afd6b7c5281d3
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites, disguised as lecture notes. The primary goal appears to be phishing or leading users to malicious content via these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd19a0337---89396345727.pdf In PDF document text
    • http://servmed.net/userfiles/file/66922621942.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d22bc1f5---bazimor.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a169ea7671da83facaca544e1e916c70/zasutisagi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/elev1l1qec5c6k3hfcj9f1dp9g/94759247693.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/51614895443.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/54pvbocni25f65v79fm5s536q5/39016910941.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/fadabisozidexevi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac60c3874e---rexiso.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/xadoluretemarelewijafik.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/zuvozuwowunodij.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d0ee66a7---36078156908.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/iltisk8iu1a7cq855uo8rdequd/47896597609.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8855b5886e4fec52aff462412b3b35fc/17118060350.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/74495116025.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb39c8b4dd---42827812081.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/1002804942.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1405b4c3---78164728555.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/3830643186.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/digikidogoxakigiranapiwi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vdfq55lv6ac2eqh75u1iprt23f/fijolipoledowamojum.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7611e37bd620b57b0d71e697142dd697/xafekerofanuzafogozomedo.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/10078137582.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/77439951764.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1b6b5bf343dc067bb08c71c08b5ab82a/jewevemaloxosurogo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f21dbcc997db06024dc052a300673781/82327395583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nuclear+and+particle+physics+lecture+notes+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_off0000bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 10908 bytes
SHA-256: 334fa3c42614d775afc157703891de93578bf58b066cac5f0fcb715c3fb3b61d
font_02_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16472 bytes
SHA-256: fb84f196f52ae20f9a09a347487ccbb95e7bc32e4ae05bfc956a1b153231471e

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