Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7111de57cdc5a3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 00:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e69a1be9b77d8be7956b2c008c55fd1 SHA-1: b8fae056f536f0e38df588d6f3eec6e762da0683 SHA-256: 2a7111de57cdc5a3254be5527492d7712a9492121047ff1597048c6d0bc617ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users by leading them to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://warehousetraining.ie/images/80638729806.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a7a4f0ea78b3afd2384753cbf292c080/jusafosefenobiwud.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/209d8b59fd200fdb3573c5be01c17cf6/jijiwijopisilos.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/dovuzuvidoxom.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/limatasabavilotajokavez.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bef071861d7---fitefijemewawomeloduga.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jusopijakulux.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30675ef595---18483506508.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/mozonu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d901a75d25b90168c7a4a94c52ca8957/gebivixetes.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ad0e7b042d581a2a0d3187c7d6572caf/72797150794.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/navibudegavi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/69146028221.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf986d731---kakuwuzus.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/45a7b8e31cfc6dba2e87d7cb8da2736c/15184632196.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ea5c35ef7ae7254603d8777535a7d92d/gewigakawufaka.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/26270496760.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/23447606840.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/42608089014.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tafire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=river+flows+in+you+guitar+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_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 18252 bytes
SHA-256: c1f9bc489d32059fb6eb9ede2064e34ce52782a82298fffd4b30521a788ebc08
font_01_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 11084 bytes
SHA-256: e57db28b3f99f32f4ac0b02eb0a377fdffbba2c7a7291ef88f3009f0ee505b70
font_02_sfnt_off00013c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1