Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23e49b85279d942…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 12:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfb0dbdd52b8efe8136ac0b4d11acb3f SHA-1: 81d61518ebcc856a326cd845a0af64c53bceb411 SHA-256: d23e49b85279d942a51635e866d6070b770206b2b3bf89a2a214289edbb83c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample 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 external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a1c8c2b8f886ab161a9c5279c4735cd9/90785933851.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a947ceda---kiralajavedojorad.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/30575382860.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/makogobal.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/23177719958.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/waden.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/pesivibizifaturemiralid.pdfIn PDF document text
    • https://fobh.net/userfiles/files/7534212237.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608669ce0af27---sawomejikupax.pdfIn PDF document text
    • http://netflor.pl/upload/File/suneju.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/82916459678.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5586bf92a3bcab0081277fc49c92415c/mawotewukiwejudeda.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91f624f44---25903613153.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/difekumeburepepakiwoke.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/36590805998.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/790211c197e6d59e184bda5933590cfe/pumizapunaw.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e56eafacb06f7c953c18ef3522546b0e/64991119505.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dnflcu7r2le96k8sub43k2die0/xivujuwivokexi.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/purazudexirazazevevel.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/newifovegalekiwolaluxi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d535ca9a61---52467727842.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/tawuret.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e166df26b---juvojivonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=employee+turnover+research+questions+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_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16148 bytes
SHA-256: a0a4b27b9f9f2ad7fd6a2135713d37f9357d3ef55534c89eaa7105f300ecaf7a
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11296 bytes
SHA-256: 9b8e1fcacf95f469dd0967788b0bde09364f068b0ca250ffc49d698d7ab85584