Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3024c747bce049b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 13:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b9669b0346041f9c4bcd281fa826c7b SHA-1: edf6962c6f857abd3154fb95d059a036c8551368 SHA-256: c3024c747bce049beaee9f8a8383f43c574434bb0c2b5bd70c4aeae9074e8190
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many of which are associated with compromised CMS uploads or link farms, reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://srsheicha.com/uploadfile/file/disozozurelinejazejujewum.pdf In PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/jekuk.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/1451328880.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/ketusarujepigobijiz.pdfIn PDF document text
    • http://dzbnf.com/upload/file///rofovunifol.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kavavotoxuxalaluzimom.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/22633bb37ee092bdf3571d6dc80f7111/megeka.pdfIn PDF document text
    • https://e-room.co/userfiles/file/nerudikenigatimuz.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/21561637617.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4ecf6c817f07981f758d50e20e62afd5/guziguvutipipa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9ptur7jsqmf05dabk5dh42vq9m/gebabutulonojunetonexu.pdfIn PDF document text
    • https://udruga-invalida.hr/files/59037685869.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/menatujo.pdfIn PDF document text
    • http://rjt1.org/upload/files/63769607153.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66b966d0f---luzusazozo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/55e231a545eecf6fd6292eb863d694a1/18523863651.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/80854173953.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/33317510294.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/wigugowokeze.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/zekotapapo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f638fa25638---wadowusuligirikewevajir.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a2412bfb---fexomapusivafaxopivo.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/84820594431.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/vekagibamumerufaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lenguaje+corporal+y+su+significado+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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 18780 bytes
SHA-256: 5fdd4c303db0dc9a08eec8f832b31b4150545d3e89bc92a4c4172b9c43766e52
font_02_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10996 bytes
SHA-256: c691d4eed66e3bb0c412f656f37707e0460ab95b79a74271b5538990980877cf

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