Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc5d08cb4829fec…

MALICIOUS

PDF

92.6 KB Created: 2021-07-07 16:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 551176e5c27617abd7e977e422ea5f67 SHA-1: 00059c27c2315f711cb473af68f679d4224b37ff SHA-256: 2bc5d08cb4829fec0a5f315e36cb603869924fd087e95ffd847ca18dbf23fcbe
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are used for phishing or malware distribution, with ClamAV detecting it as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f0d44b09---98523137255.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vutonoli.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083239f162fb---51078734936.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c0845ee4---90576839362.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b079c394696---40781600217.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/56454579066.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/93295950059.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd613c0774d---42079823229.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61530d64---femirokaxadomomawivekilor.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sawotizumite.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/87171436859.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/satepatezifaweriregedur.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/muzagodusixubuwopufusoj.pdfIn PDF document text
    • http://abnicum.com/files/file/79818017699.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65584458640.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/46675151771.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fce30720---kesasijavavuvosenidorow.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca5de8e3b---98088467573.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/32500048416.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/wasagudanajojiwivad.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zinubona.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/90d9a305b7cac23378aa233443dbc868/5563513114.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/80590627181.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/50560233628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=institutional+corruption+definitionPDF 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_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10664 bytes
SHA-256: 5ccfc16d2afd4f8268abb0432c7da201e25c4a61874d17a6bb18313394c9857a
font_01_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 17200 bytes
SHA-256: 22f749015870317b8f37cf5efc54d2a4c652458799ffb3751e0a2148cedbd4f3
font_02_sfnt_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1