Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e37ea73524c9ed…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 21:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a300f08dd0d9f107ad6d29d81b4e8d03 SHA-1: 376b085a53c7354ab033b62eca735936b147fbe1 SHA-256: c5e37ea73524c9eda32064395e6f9b6928a7e2fd856fceb34baa66c5b9c9b127
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, specifically within plugin upload directories. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=exercise+for+pcos+pdf PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0e44faa1faf2f7feff11f43a79dd5bd3/ruwigopapa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d23dc70bdeb---3651212497.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/de469d16fbf7d6ef738c4e8b0d8ce08e/podexanabakotatakiwem.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cb230763a2d5346f408fffd8abc85489/vudomupagakejepud.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981b61197f---vutikusurugurulapolebonut.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b35821f4b---3214845516.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/semonuvidadeleta.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/18716635710.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7959041c04---97568353846.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/uouqk9stu2rtjap7gs1aclnet7/70583329852.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/logekifudewobopudo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bogomidizivokisidag.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7e5173473fd3125a42215fe8d88f0b9b/wirulufurujereruponad.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/17223412355.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/54847772152.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/saxarodexele.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa63f7e107---20035436264.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/176ba116f16de0aa237b8373c8c0af47/83898614265.pdfIn PDF document text
    • https://deepex.hu/hirek/files/wusevozepakawojos.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/91612814596.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fipamowolokuxixetoxizera.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/dakezo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62a955c12---sofijizofivurun.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/nitavavonidorutiju.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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10288 bytes
SHA-256: a5603a798b34a5c295083e1f4d76b6e3b9b21a80aac6bb555307f9117429e7b8
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 19356 bytes
SHA-256: 96b9d154e857ba813117b97390bee55907dffc0f1cc55169897de74d0ce449ea
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1