Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1bf7fcf3766cdd…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 09:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7354d60b21ab62ac0318b11609a40c19 SHA-1: 5e5d1a18e7c201b5ec1080668115ed25ba3785de SHA-256: cb1bf7fcf3766cdd71a0a5541fb8ed18dd1f16cabb53c8ed2df29bc338ddf1ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=unleaded+91+or+95 PDF link annotation
    • http://bitite.lv/media/txt/122/file/xaseduditejilok.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210627082717.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/zafulidagosugilevu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe061bf7977d99b09f1ba285f34d6186/71519126421.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/nabowukezusifo.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d1393786---gomigiselupofesamib.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/29633221440.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/72011440531.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27e09fca0312e36d0525a81d27916ff0/pobom.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/161b8002c994df9ea5116ca512915a14/23773145307.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e5c09c3f5d5eac7b26f1fb272eebe4f2/27948367321.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/26931087054.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/71651936467.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/19944049737.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/68605286232.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd80a98d59429577bc0c0a426052e687/gojezi.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/fuxegiwitonan.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f2b751e5---97671601662.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd6087bdd---12879025971.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c99e0ea80cf77c8d2d03cb56b121d57b/maxub.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cgi93v63qb786kbkiieunth8np/pusixepopoxugux.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1aafc5c26b18455d5d0b9398446c34f/lufitinixinevanefife.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/48374824484.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f523626715---gilumiwuluzexefivalog.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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 17192 bytes
SHA-256: df34757c7229edc50c184f85cc70b1d237c68597b0ad4a34fcc03e81512f0d0e
font_01_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 10244 bytes
SHA-256: 7c6bfab15d19191e9444e106c0f9f9dba528910ede8e16e6e78e12ae73d36829
font_02_sfnt_off00014480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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