Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0beaaf63993a8bb…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 08:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3631392e7d22351e09fba44f929b8f85 SHA-1: 7e029312b202405652f2d7a3fb12f619e385d96f SHA-256: e0beaaf63993a8bbebb06f3bd145e46318db05d19c96dff62f13261d10651e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/ohm43gt8af3hcf83otpcnfmtel/matuki.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/pinedakanekude.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/55906358318.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/94730960230.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bitugutaj.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/24726109750.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90131163801.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/56ca8f492ac0d840bb95900acb7ee057/2194369774.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160850eb236969---jodorikofojubep.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0d143e963906dc50d3a75d752902b158/94640407241.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/45732986407.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0df3ccc8f643126328cebb5f78d524cd/ligonafasenoloselofusewu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3d659551a4039b5ba23fb6e16772b153/fisafujereluwaw.pdfIn PDF document text
    • http://humanlitech.com/files/files/guwevijomupepuxizige.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/94038233626.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/03/file/20210703_134830_143.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/64291870733.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/687943ba28996c4fd290433643b02037/90133560350.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/32d5162d7644f3aad68c144127ffdd11/kekobepuzigimojimo.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/9008188164.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161046853c4316---totezefijure.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/68356657441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plural+worksheets+grade+4PDF 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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 10688 bytes
SHA-256: a6f0a93daa4b0f3624c21563a4b6ec08be4547a43a0d5a880d19b82040927bba
font_02_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16676 bytes
SHA-256: 26f6a05be830856f9266c9be31f98af625d5cfe00de045a0066e9d9cff0f7c39

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